As filed with the Securities and Exchange Commission on November 3,December 10, 2004

Registration No. 333-333-120187

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

AMENDMENT NO. 1 TO
FORM S-1
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

CELANESE CORPORATION
(Exact name of registrant as specified in its charter)

1601 West LBJ Freeway
Dallas, TX 75234-6034
+1-972-443-4000

(Address, including zip code, and telephone number, including area code, of registrants' principal executive offices)
Secretary
550 U.S. Highway 202/206
Bedminster, NJ 07921-1590
(908) 901-4500

(Name, address, including zip code, and telephone number, including area code, of agent for service)

With copies to:

        Approximate date of commencement of proposed sale to the public:    As soon as practicable after this Registration Statement is declared effective.

        If any of the securities being registered on this Form are being offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box.    o

        If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

        If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

        If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    o

        If delivery of the prospectus is expected to be made pursuant to Rule 434, please check the following box.    o

CALCULATION OF REGISTRATION FEE

(1)

Estimated solely for the purpose of calculating the registration fee under Rule 457(o) of the Securities Act of 1933, as amended (the "Securities Act").

(2)

The preferred stock purchase rights initially will trade together with the common stock. The value attributable to the preferred stock purchase rights, if any, is reflected in the offering price of the common stockstock.

(3)

$95,025 of the total registration fee of $126,700 was paid on November 3, 2004, prior to the initial filing of the registration statement. Therefore, the total registration fee payable upon the filing of this Amendment No. 1, calculated in accordance with Rule 457(o) under the Securities Act, is $31,675.

        The registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until this Registration Statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell securities and we are not soliciting offers to buy these securities in any jurisdiction where the offer or sale is not permitted.

PROSPECTUS (Subject to Completion)
Issued

              Shares

Celanese Corporation

COMMON STOCK

Celanese Corporation is offering               shares of its common stock. We intend to use approximately $$199 million of the net proceeds from the sale of the shares being sold by us in this offering to payredeem a dividend toportion of the senior discount notes of our stockholders existing prior to this offering.subsidiary. We intend to use approximately $566 million of the net proceeds from the sale of the shares being sold by us in this offering to redeem a portion of the senior subordinated notes of another of our subsidiaries. We intend to use borrowings under the new senior credit facilities that our subsidiaries expect to enter into prior to the consummation of this offering, together with any remaining proceeds from the sale of the shares being sold by us in this offering, to repay certainall amounts outstanding under the existing senior credit facilities and the floating rate term loan of our indebtednesssubsidiaries and for other general corporate purposes.to pay an approximately $752 million dividend to our stockholders existing prior to this offering. This is our initial public offering and no public market currently exists for our shares. We anticipate that the initial public offering price will be between $               and $               per share.

We intend to list the common stock on the New York Stock Exchange under the symbol "     ."

Investing in the common stock involves risks. See "Risk Factors" beginning on page 11.12.

PRICE$            A SHARE

We have granted the underwriters the right to purchase up to an additional              shares to cover over-allotments. We intend to use the net proceeds from any shares sold pursuant to the underwriters' over-allotment option to pay an additional dividend to our stockholders existing prior to this offering.

The Securities and Exchange Commission and state securities regulators have not approved or disapproved these securities, or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

                        expectsMorgan Stanley & Co. Incorporated and Lehman Brothers Inc. expect to deliver the shares to purchasers on              ,          2004..

                       ,         2004

TABLE OF CONTENTS

        You should rely only on the information contained in this prospectus. None of the Issuer nor its subsidiaries has authorized anyone to provide you with information different from that contained in this prospectus. The prospectus may be used only for the purposes for which it has been published and no person has been authorized to give any information not contained in this prospectus. If you receive any other information, you should not rely on it. The Issuer is not making an offer of these securities in any state where the offer is not permitted.

        Until                        , 2004         (25 days after the date of this prospectus), all dealers that buy, sell or trade our common stock, whether or not participating in this offer, may be required to deliver a prospectus. This is in addition to the dealers' obligation to deliver a prospectus when acting as underwriters and with respect to their unsold allotments or subscriptions.

i

BASIS OF PRESENTATION

        In this prospectus, the term "the Issuer" refers to Celanese Corporation, a Delaware corporation, and not its subsidiaries and the terms "we," "our" and "us" refer to the Issuer and its subsidiaries on a consolidated basis. The term "BCP Crystal" refers to our subsidiary BCP Crystal US Holdings Corp., and not its subsidiaries. The term "Purchaser" refers to our subsidiary, Celanese Europe Holding GmbH & Co. KG, formerly known as BCP Crystal Acquisition GmbH & Co. KG, a German limited partnership (Kommanditgesellschaft, KG), and not its subsidiaries, except where otherwise indicated. Unless we specifically state otherwise, references to "pro forma" give effect, in the manner described under "Unaudited Pro Forma Financial Information" and the notes thereto, to (i) the Transactions and the Recent Restructuring (each as defined in this prospectus) and (ii) this offering, the entering into the new senior credit facilities and the use of proceeds.proceeds therefrom (collectively, the "Concurrent Financings").

        Pursuant to a voluntary tender offer commenced in February 2004, the Purchaser, an indirect wholly-owned subsidiary of the Issuer, in April 2004 acquired approximately 84.3%84% of the ordinary shares of Celanese AG (the "Celanese Shares") outstanding as of June 30, 2004.outstanding. All references in this prospectus to the outstanding ordinary shares of Celanese AG exclude treasury shares. As of JuneSeptember 30, 2004, the Issuer's indirect ownership of approximately 84.3%84% of the outstanding Celanese Shares would equate to approximately 75.9%76% of the issued Celanese Shares (including treasury shares). Pursuant to a mandatory offer commenced in September 2004 and continuing as of the date of this prospectus, the Purchaser acquired additional Celanese Shares. As a result of these acquisitions, partially offset by the issuance of additional shares of Celanese AG as a result of the exercise of options issued under the Celanese AG stock option plan, as of the date of this prospectus, we own approximately 84% of the outstanding Celanese Shares.

        The Issuer is a recently-formed company which does not have, apart from the financing of the Transactions (as defined in this prospectus), any independent external operations other than through the indirect ownership of the Celanese businesses. The Issuer's unaudited consolidated financial statements as of and for the threesix months ended JuneSeptember 30, 2004 and the unaudited consolidated financial statements of Celanese AG for the three months ended March 31, 2004 and the sixnine months ended JuneSeptember 30, 2003 (together, the "Interim Consolidated Financial Statements"), are included elsewhere in this prospectus. For accounting purposes, the Issuer and its consolidated subsidiaries are referred to as the "Successor." See notes 2 and 4 to the Interim Consolidated Financial Statements for additional information on the basis of presentation and accounting policies of the Successor.

        Celanese AG is incorporated as a stock corporation (Aktiengesellschaft, AG) organized under the laws of the Federal Republic of Germany. As used in this prospectus, the term "Celanese" refers to Celanese AG and Celanese Americas Corporation, their consolidated subsidiaries, their non-consolidated subsidiaries, joint ventures and other investments, except that with respect to shareholder and similar matters where the context indicates, "Celanese" refers to Celanese AG. For accounting purposes, "Celanese" or "Predecessor" refers to Celanese AG and its majority owned subsidiaries over which Celanese AG exercises control, as well as special purpose entities which are variable interest entities where Celanese is deemed the primary beneficiary. See note 3 to the consolidated financial statements of Celanese as of December 31, 2003 and 2002 and for each of the years ended December 31, 2003, 2002 and 2001 contained in this prospectus (the "Celanese Consolidated Financial Statements").

        The Celanese Consolidated Financial Statements included in this prospectus were prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") for all periods presented. The Celanese Consolidated Financial Statements reflect, for the periods indicated, the financial condition, results of operations and cash flows of the businesses transferred to Celanese from Hoechst Aktiengesellschaft, also referred to as Hoechst"Hoechst" in this prospectus, in a demerger that

ii

became effective on October 22, 1999, adjusted for acquisitions and divestitures. The Celanese

ii

Consolidated Financial Statements and other financial information included in this prospectus, unless otherwise specified, have been presented to separately show the effects of discontinued operations.

        Celanese AG is a foreign private issuer and previously filed its consolidated financial statements as of December 31, 2003 and 2002 and for each of the years in the three-year period ended December 31, 2003 on Form 20-F. In accordance with German law, the reporting currency of the Celanese AG consolidated financial statements is the euro. As a result of the Purchaser's acquisition of voting control of Celanese, the financial statements of Celanese contained in this prospectus are reported in U.S. dollars to be consistent with our reporting requirements. For Celanese AG's reporting requirements, the euro continues to be the reporting currency.

        In the preparation of other information included in this prospectus, euro amounts have been translated into U.S. dollars at the applicable historical rate in effect on the date of the relevant event/period. For purposes of pro forma and prospective information, euro amounts have been translated into U.S. dollars using the rate in effect on JuneSeptember 30, 2004. Our inclusion of this information is not meant to suggest that the euro amounts actually represent such dollar amounts or that such amounts could have been converted into U.S. dollars at any particular rate, if at all.

MARKET AND INDUSTRY DATA AND FORECASTS

        This prospectus includes industry data and forecasts that the Issuer has prepared based, in part, upon industry data and forecasts obtained from industry publications and surveys and internal company surveys. Third-party industry publications and surveys and forecasts generally state that the information contained therein has been obtained from sources believed to be reliable, but there can be no assurance as to the accuracy or completeness of included information.reliable. In this prospectus, the terms "SRI Handbook," "CMAI Methanol Analysis," "Nexant Chem Study 2003," "Nexant Chem Study 2002" and "Tecnon Orbichem Survey" refer to the SRIInternational Chemical Economics Handbook,CMAI 2002-2003 World Methanol Analysis, Nexant Chem SystemsSeptember 2003 PERP Acetic Acid Study, Nexant Chem SystemsFebruary 2002 Vinyl Acetate Study and Tecnon OrbichemAcetic Acid and Vinyl Acetate World Survey September 2003 report, respectively. The statements regarding Celanese's market position in this prospectus are based on information derived from the SRI Handbook, CMAI Methanol Analysis, Tecnon Orbichem Survey, Nexant Chem Study 2002 and Nexant Chem Study 2003.

        AO Plus™, BuyTiconaDirect™, CelActiv™, Celanex®, Celcon®, Celstran®, Celvolit®, Compel®, GUR®, Hoecat®, Hostaform®, Impet®, Impet-HI®, Mowilith®, Nutrinova® DHA, Riteflex®, Sunett®, Topas®, Vandar®, VAntage™, Vectra®, Vectran® and certain other products and services named in this prospectus are registered trademarks and service marks of Celanese. Fortron® is a registered trademark of Fortron Industries, a joint venture of Celanese.

iii

PROSPECTUS SUMMARY

        This summary highlights selected information in this prospectus, but it may not contain all of the information that you should consider before deciding to invest in our common stock. You should read this entire prospectus carefully, including the "Risk Factors" section and the financial statements, which are included elsewhere in this prospectus.

        See "Market and Industry Data and Forecasts" on page iii for the sources of our leadership statements below.

CELANESE CORPORATION

        We are an integrated global producer of value-added industrial chemicals and have #1 or #2 market positions worldwide in products comprising the majority of our sales. We are also the world's largest producer of acetyl products, including acetic acid, vinyl acetate monomer (VAM), and polyacetals (POM) and a leading global producer of high-performance engineered polymers used in consumer and industrial products and designed to meet highly technical customer requirements. Our operations are located in North America, Europe and Asia, including substantial joint ventures in China. We believe we are one of the lowest-cost producers of key building block chemicals in the acetyls chain, such as acetic acid and VAM, due to our economies of scale, operating efficiencies and proprietary production technologies.

        Our pro forma net sales were approximately $4.6 billion for the year ended December 31, 2003 and approximately $2.47 billion for the six months ended June 30, 2004. See "Unaudited Pro Forma Financial Information."

We have a large and diverse global customer base consisting principally of major companies in a broad array of industries. In 2003, 39% of our net sales were to customers located in North America, 40% to customers in Europe and 21% to customers in Asia, Australia and the rest of the world.

Segment Overview

        We operate through four business segments: Chemical Products, Technical Polymers Ticona, Acetate Products and Performance Products. The table below illustrates each segment's net sales to external customers for the year ended December 31, 2003, as well as each segment's major products and end use markets.

(1)

2003 net sales of $4,603 million also include $49 million in net sales from Other Activities. 2003 Net Sales of Chemical Products excludes $97 million in inter-segment sales.

(2)

In October 2004, we announced our plans to discontinue filament production by mid 2005 and to consolidate our flake and tow production at three sites instead of the current five.

Chemical Products

        Our Chemical Products segment produces and supplies acetyl products, including acetic acid, acetate esters, vinyl acetate monomer, polyvinyl alcohol, and emulsions. We are a leading global producer of acetic acid, the world's largest producer of vinyl acetate monomer and the largest North American producer of methanol, the major raw material used for the production of acetic acid. We are also the largest polyvinyl alcohol producer in North America.

Technical Polymers Ticona

        Our Technical Polymers Ticona segment develops, produces and supplies a broad portfolio of high performance technical polymers for use in automotive and electronics products and in other consumer and industrial applications, often replacing metal or glass. Together with our 45%-owned joint venture Polyplastics Co.Ltd ("Polyplastics"), our 50%-owned joint venture Korea Engineering Plastics Company Ltd., and Fortron Industries, our 50-50 joint venture with Kureha Chemicals Industry of Japan, we are a leading participant in the global technical polymers business.

Acetate Products

        Our Acetate Products segment primarily produces and supplies acetate tow, which is used in the production of filter products and acetate filament, which is used in the apparel and home furnishing industries. We are one of the world's leading producers of acetate tow and acetate filament, including production by our joint ventures in China. In October 2004, we announced plans to consolidate our acetate flake and tow manufacturing by early 2007 and to exit the acetate filament business by mid-2005. This restructuring is being implemented to increase efficiency, reduce over-capacities in certain manufacturing areas, and to focus on products and markets that provide long-term value.

Performance Products

        The Performance Products segment operates under the trade name of Nutrinova and produces and sells a high intensity sweetener and food protection ingredients, such as sorbates, for the food, beverage and pharmaceuticals industries.

Competitive Strengths

        We have benefited from a number of competitive strengths, including the following:

•

Leading Market Positions. We have #1 or #2 market positions globally in products that make up a majority of our sales according to SRI Handbook and Tecnon Orbichem Survey. Our leadership positions are based on our large share of global production capacity, operating efficiencies, proprietary technology and competitive cost structures in our major products.



•

Proprietary Production Technology and Operating Expertise. Our production of acetyl products employs industry leading proprietary and licensed technologies, including our proprietary AO Plus acid-optimization technology for the production of acetic acid and VAntage vinyl acetate monomer technology.



•

Low Cost Producer. Our competitive cost structures are based on economies of scale, vertical integration, technical know-how and the use of advanced technologies.



•

Global Reach. We operate 24 production facilities (excluding our joint ventures) throughout the world, with major operations in North America, Europe and Asia. Joint ventures owned by us and our partners operate nine additional facilities. Our infrastructure of manufacturing plants, terminals, and sales offices provides us with a competitive advantage in anticipating and meeting the needs of our global and local customers in well-established and growing markets, while our geographic diversity reduces the potential impact of volatility in any individual country or region.

•

International Strategic Investments. Our strategic investments, including our joint ventures, have enabled us to gain access, minimize costs and accelerate growth in new markets, while also generating significant cash flow and earnings.



•

Diversified Products and End-Use Markets. We offer our customers a broad range of products in a wide variety of end-use markets. This product diversity and exposure help us reduce the potential impact of volatility in any individual market segment.

Business Strategies

        We are focused on increasing operating cash flows, profitability, return on investment and shareholder value, which we believe can be achieved through the following business strategies:

•

Maintain Cost Advantage and Productivity Leadership. We continually seek to reduce our production and raw material costs. Our advanced process control projects (APC) generate significant savings in energy and raw materials while increasing yields in production units. Energy and raw materials savings resulting from APC projects were approximately $10 million in 2003 and $14 million in the nine-months ended September 30, 2004. We intend to continue using best practices to reduce costs and increase equipment reliability in maintenance and project engineering.



•

Focused Business Investment. We intend to continue investing strategically in growth areas, including new production capacity, to extend our global market leadership position. We expect to continue to benefit from our investments and capacity expansion that enable us to meet increases in global demand.



•

Maximize Cash Flow and Reduce Debt. Despite a difficult operating environment over the past several years, we have generated a significant amount of operating cash flow. We believe there are significant opportunities to further increaseimprove our operating cash flow through increasing productivity, receiving cash dividends from our joint ventures and pursuing additional cost reduction efforts. We believe in a focused capital expenditure plan that is dedicated to attractive investment projects. We intend to use our free cash flow to reduce indebtedness and selectively expand our businesses. The operating cash flow generated in the nine months ended September 30, 2004 was $2 million. The cash flow generation from operations was affected by the one time payment of a $95 million obligation to a third party, $59 million associated with the exercising of stock appreciation rights and pension contributions totaling $157 million and higher interest expense due to increased debt levels.



•

Deliver Value-Added Solutions. We continually develop new products and industry leading production technologies that solve our customers' problems. We believe that our customers value our expertise, and we will continue to work with them to enhance the quality of their products.



•

Enhance Value of Portfolio. We will continue to further optimize our business portfolio through divestitures, acquisitions and strategic investments that enable us to focus on businesses in which we can achieve market, cost and technology leadership over the long term. In addition, we intend to continue to expand our product mix into higher value-added products.

THE TRANSACTIONS

        As used in this prospectus, the term "Transactions" means, collectively, the Tender Offer, the Original Financing, the Refinancing and the Senior Discount Notes Offering described under "The Transactions" elsewhere in this prospectus.

        Pursuant to the Tender Offer, in April 2004 the Purchaser, an indirect wholly owned subsidiary of the Issuer, acquired, at a price of €32.50 per share, a total of 41,588,227 Celanese Shares, representing approximately 84.3%84% of the Celanese Shares outstanding as of JuneSeptember 30, 2004. Pursuant to a mandatory offer commenced in September 2004 and continuing as of the date of this prospectus, the Purchaser acquired additional Celanese Shares. As a result of these acquisitions, partially offset by the issuance of additional shares of Celanese AG as a result of the exercise of options issued under the Celanese AG stock option plan, as of the date of this prospectus, we own approximately 84% of the outstanding Celanese Shares. The Purchaser may from time to time purchase or be required to purchase any or all of the outstanding Celanese Shares not owned by it in market transactions or otherwise. Examples of instances in which the Purchaser may be required to purchase additional Celanese shares include the ongoing mandatory offer relating to the domination and profit and loss transfer agreement entered into by the Purchaser and Celanese AG, or additional mandatory offers required by actions that the Purchaser or its affiliates may take in the future, such as a possible delisting of the Celanese Shares from the Frankfurt Stock Exchange, a possible squeeze-out of the minority shareholders of Celanese AG or a possible conversion of Celanese AG into a different legal form. The Purchaser's decision to pursue subsequent voluntary purchases will depend on, among other factors, the then-prevailing market prices and any negotiated terms with minority shareholders. See "The Transactions—Post-Tender Offer Events."

RECENT RESTRUCTURING

        We recently completed an internal restructuring of certain of our operations. See "The Recent Restructuring."

RECENT DEVELOPMENTS

        In October 2004, we announced plans to implement a strategic restructuring of our acetate business to increase the efficiency, reduce overcapacity in certain areas and to focus on products and markets that provide long-term value. As part of this restructuring, we plan to discontinue acetate filament production by mid-2005 and to consolidate our acetate flake and tow operations at three locations, instead of five. The restructuring is expected to result in significant severance costs, asset retirement obligations and impairment charges. Sales of acetate filament were $118 million in 2003.

        On October 27, 2004 we agreed to acquire Acetex Corporation, a Canadian corporation, for approximately $261 million and the assumption by us of debt owed by Acetex, valued at approximately $231 million. Acetex has two primary businesses: the Acetyls Business and the Specialty Polymers and Films Business. The Acetyls business produces acetic acid, polyvinyl alcohol and vinyl acetate monomer. The Specialty Polymers and Films Business produces specialty polymers (used in the manufacture of a variety of plastics products, including packaging and laminating products, auto parts, adhesives and medical products) as well as products for the agricultural, horticultural and construction industries. Acetex will be operated as part of our chemicals business. Closing of the acquisition is conditioned upon Acetex shareholder approval, regulatory approvals and other customary conditions. In connection with the funding ofWe expect to finance this acquisition through borrowings under the new senior credit facilities.

        On November 23, 2004, we agreed to acquire Vinamul Polymers, the emulsion polymer business of National Starch and Chemical Company, for $208 million. National Starch and Chemical Company is a subsidiary of Imperial Chemical Industries PLC. The Vinamul Polymers product line includes vinyl acetate-ethylene copolymers, vinyl acetate homopolymers and copolymers, and acrylic and vinyl acrylic emulsions. Vinamul Polymers operates manufacturing facilities in the United States, Canada, the United Kingdom and The Netherlands. As part of the agreement, National Starch and Chemical Company will continue to supply Vinamul Polymers with starch, dextrin and other specialty ingredients following the acquisition. We will supply the Vinamul Polymers business with vinyl acetate monomer and polyvinyl alcohols. We expect to amend the senior credit facilities and to borrow approximately $500 millionfinance this acquisition through borrowings under the amendednew senior credit facilities.

        Our principal executive offices are located at 1601 West LBJ Freeway, Dallas, TX 75234-6034 and our main telephone number is +1-972-443-4000.

THE OFFERING

        Unless we specifically state otherwise, all information in this prospectus:

•

assumes no exercise by the underwriters of their over-allotment option;

•

gives effect to the        for one stock split we expect to effect prior to the consummation of the offering;



•

excludes            shares of common stock reserved for issuance in connection with our equity incentive plans; and



•

does not reflect our pending acquisitionacquisitions of Acetex and Vinamul Polymers or the indebtedness we expect to incur in connection with that acquisition.those acquisitions.

RISK FACTORS

        InvestingAn investment in our common stock involves substantial risk.risks. You should carefully consider all the information in this prospectus prior to investing in our common stock. In particular, we urge you to consider carefully the factors set forth under the heading "Risk Factors."

SUMMARY HISTORICAL AND PRO FORMA FINANCIAL DATA

        The balance sheet data shown below for 2002 and 2003, and the statements of operations and cash flow data for 2001, 2002 and 2003, all of which are set forth below, are derived from the audited Celanese Consolidated Financial Statements included elsewhere in this prospectus and should be read in conjunction with those financial statements and the notes thereto. The balance sheet data for 2001 are unaudited and have been derived from, and translated into U.S. dollars based on, Celanese's historical euro audited financial statements.

        The summary historical financial data for the sixnine months ended JuneSeptember 30, 2003 and the three months ended March 31, 2004 have been derived from the unaudited consolidated financial statements of Celanese, which have been prepared on a basis consistent with the audited consolidated financial statements of Celanese as of and for the year ended December 31, 2003. The summary historical financial data as of and for the threesix months ended JuneSeptember 30, 2004 have been derived from our unaudited consolidated financial statements. In the opinion of management, such unaudited financial data reflect all adjustments, consisting only of normal and recurring adjustments, necessary for a fair presentation of the results for those periods. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year or any future period. The unaudited consolidated financial information as of JuneSeptember 30, 2004 and for each of the three months ended March 31, 2004, and Junesix months ended September 30, 2004 and the sixnine months ended JuneSeptember 30, 2003 is included elsewhere in this prospectus.

        The following summary unaudited pro forma financial data have been prepared to give pro forma effect to the Transactions, the Recent Restructuring this offering and the use of proceeds,Concurrent Financings, as if they had occurred on January 1, 2003, in the case of our unaudited pro forma statements of operations data, and on JuneSeptember 30, 2004, in the case of our unaudited pro forma balance sheet data. The pro forma financial data are for informational purposes only and should not be considered indicative of actual results that would have been achieved had the Transactions, the Recent Restructuring, this offering and the use of proceedsConcurrent Financings actually been consummated on the dates indicated and do not purport to indicate balance sheet data or results of operations as of any future date or for any future period. You should read the following data in conjunction with "The Transactions," "The Recent Restructuring," "Unaudited Pro Forma Financial Information," "Management's Discussion and Analysis of Financial Condition and Results of Operations" and the Celanese Consolidated Financial Statements and the Interim Consolidated Financial Statements included elsewhere in this prospectus.

        As of JuneSeptember 30, 2004, the Purchaser, an indirect wholly owned subsidiary of the Issuer, owned approximately 84.3%84% of the Celanese Shares then outstanding. The Issuer is a recently-formed company which, apart from the financing of the Transactions, does not have any independent external operations other than through the indirect ownership of Celanese's business. Accordingly, financial and other information of Celanese is presented in this prospectus. This prospectus presents the financial information relating to Celanese under the caption "Predecessor" and the information relating to us under the caption "Successor." See "The Transactions."

(1)

We owned approximately 84.3%84% of the Celanese Shares outstanding as of JuneSeptember 30, 2004 and the pro forma information presented above assumes that we do not acquire any additional Celanese Shares. Assuming the Purchaser were to pay the fair cash compensation offer price required by the domination and profit and loss transfer agreement (the "Domination Agreement") of €41.92, plus interest, per share for all remaining Celanese Shares, earnings from continuing operations and EBITDA would each be higher by the amount of minority interest expense.

(2)

Special charges include impairment charges, provisions for restructuring, which include costs associated with employee termination benefits and plant and office closures, certain insurance recoveries and other expenses and income incurred outside the normal course of ongoing operations. See note 25 to the Celanese Consolidated Financial Statements and note 1314 to the Interim Consolidated Financial Statements.

(3)

Interest and other income (expense), net, includes interest income, dividends from cost basis investments and other non-operating income (expense).

(4)

EBITDA, a performance measure used by management, is defined as earnings (loss) from continuing operations, plus interest expense net of interest income, income taxes and depreciation and amortization, as shown in the table below. EBITDA is useful to investors because it is frequently used by securities analysts, investors and other interested parties in the evaluation of companies in our industry. See "Special Note Regarding Non-GAAP Financial Measures." EBITDA is not a recognized term under GAAP and does not purport to be an alternative to net earnings as a measure of operating performance or to cash flows from operating activities as a measure of liquidity. Because not all companies use identical calculations, this presentation of EBITDA may not be comparable to other similarly titled measures of other companies.

Additionally, EBITDA is not intended to be a measure of free cash flow for management's discretionary use, as it does not consider certain cash requirements such as interest payments, tax payments and debt service requirements. The amounts shown for EBITDA as presented in this prospectus differ from the amounts calculated under the definition of EBITDA used in our debt instruments. The definition of EBITDA used in our debt instruments is further adjusted for certain cash and non-cash charges and is used to determine compliance with financial covenants and our ability to engage in certain activities such as incurring additional debt and making certain payments. See "Management's Discussion of Financial Condition and Results of Operations—Liquidity and Capital Resources—Liquidity—Covenants."

        EBITDA is calculated and reconciled to net earnings (loss) as follows (unaudited):

(5)

EBITDA, as defined above, was (increased) reduced by the following unusual items, each of which is further discussed below (unaudited):

(a)

Represents the expense associated with stock appreciation rights that will not be incurred subsequent to the Transactions as it is expected that the plan will be replaced with other management equity arrangements that will not result in a cash cost to Celanese.

(b)

Represents provisions for restructuring, asset impairment, transaction costs and other unusual expenses and income incurred outside the ordinary course of business. See "Management's Discussion and Analysis of Financial Condition and Results of Operations."

(c)

Represents the portion of restructuring charges (consisting of employee termination benefits) that were not included in special charges.

(d)

Represents other non-operating (income) expense (other than dividends). See "Management's Discussion and Analysis of Financial Condition and Results of Operations."

(e)

Represents primarily the expense associated with executive contract terminations, transaction costs not included in special charges, and rent expense paid to a variable interest entity that has been consolidated since the first quarter of 2004.

The unusual items listed above exclude adjustments to reserves, principally environmental reserves and loss reserves at the captive insurance entities, made in the ordinary course of business resulting from changes in estimates based on favorable

trends in environmental remediation and actuarial revaluations. See "Management's Discussion and Analysis of Financial Condition and Results of Operations."

(6)

EBITDA, as defined above, was also (increased) reduced by the following other non-cash items, each of which is further discussed below (unaudited):

(a)

Represents the portion of pension and other postretirement ("OPEB") expense resulting from amortization of unrecognized actuarial losses, prior service costs and transition obligations. In addition, the Issuer expectswe expect Celanese's future pension expense to be reduced as a result of the pre-funding of $463 million of pension contributions in connection with the Transactions. Assuming an annual long-term rate of return on plan assets of 7.93%, Celanese's annual pension expense would decrease by an additional $37 million. See "Unaudited Pro Forma Financial Information."

(b)

Represents the adjustment to reflect earnings of investments accounted for under the equity method on a cash basis.

(c)

Relates primarily to non-cash expense associated with stock option plans.

(d)

Represents the one-time charge to cost of sales resulting from purchase accounting for inventories.

(e)

Represents minority interest expense relating to the 15.7%approximately 16% of the Celanese Shares outstanding at JuneSeptember 30, 2004 that we did not own, net of actual dividends paid during the period. See note (7).

(7)

In the threenine months ended JuneSeptember 30, 2004, Celanese AG declared and paid a dividend of €0.12 ($0.14) per share for the year ended December 31, 2003. See "The Transactions" for information on future dividends that may be required under German law to be paid to Celanese AG's minority shareholders.

(8)

Trade working capital is defined as trade accounts receivable from third parties and affiliates net of allowance for doubtful accounts, plus inventories, less trade accounts payable to third parties and affiliates. For the calculation of trade working capital, see note (8) to "Selected Historical Financial Data."

(9)

Our mandatorily redeemable preferred stock was repaid with the proceeds of the offering of the senior subordinated notes that occurred on July 1, 2004.

RISK FACTORS

        An investment in our common stock involves risks. You should carefully consider the risks described below, together with the other information in this prospectus, before deciding to purchase any common stock.

Risks Related to the Acquisition of Celanese

        If the Domination Agreement ceases to be operative, the Issuer's managerial control over Celanese AG is limited.

        As of the date of this prospectus, we own 100% of the outstanding shares of Celanese Americas Corporation ("CAC") and approximately 84% of the outstanding shares of Celanese AG. Our access to cash flows of, and our control of, Celanese AG is subject to the continuing effectiveness of the Domination Agreement. See "The Transactions—Post-Tender Offer Events—Domination and Profit and Loss Transfer Agreement."

        The Domination Agreement is subject to legal challenges instituted by dissenting shareholders. Minority shareholders have filed nine actions against Celanese AG in the Frankfurt District Court (Landgericht), seeking, among other things, to set aside the shareholder resolutions passed at the extraordinary general meeting held on July 30 and 31, 2004 based, among other things, on the alleged violation of procedural requirements and information rights of the shareholders, to declare the Domination Agreement and the change in the fiscal year void and to prohibit Celanese AG from performing its obligations under the Domination Agreement. Pursuant to German law, the time period for the filing of such challenges has expired. Further, two additional minority shareholders have joined the proceedings via third party intervention in support of the plaintiffs. The Purchaser has joined the proceedings via third party intervention in support of Celanese AG. In addition, a German court could revoke the registration of the Domination Agreement in the commercial register. On August 2, 2004, two minority shareholders instituted public register proceedings with the Königstein Local Court (Amtsgericht) and the Frankfurt District Court, both with a view to have the registration of the Domination Agreement in the Commercial Register deleted (Amtslöschungsverfahren). See "Business—Legal Proceedings."

        If the Domination Agreement ceases to be operative, the Purchaser's ability, and thus our ability to control the board of management decisions of Celanese AG, will be significantly limited by German law. As a result, we may not be able to ensure that our strategy for the operation of our business can be fully implemented. In addition, our access to the operating cash flow of Celanese AG in order to fund payment requirements on our indebtedness will be limited, which could have a material adverse effect on the value of our common stock.

        If the Domination Agreement ceases to be operative, certain actions taken under the Domination Agreement might have to be reversed.

        If legal challenges of the Domination Agreement by dissenting shareholders of Celanese AG are successful, some or all actions taken under the Domination Agreement, including the Recent Restructuring, may be required to be reversed and the Purchaser may be required to compensate Celanese AG for damages caused by such actions. Any such event could have a material adverse effect on our ability to make payments on our indebtedness and on the value of our common stock.

        Minority shareholders may interfere with Celanese AG's future actions, which may prevent us from causing Celanese AG to take actions which may have beneficial effects for our shareholders.

        The Purchaser currently owns approximately 84% of the Celanese Shares. Shareholders unrelated to us hold the remainder of the outstanding Celanese Shares. German law provides certain rights to minority shareholders, which could have the effect of delaying, or interfering with, corporate actions

(including those requiring shareholder approval), such as the potential application for revocation of admission of the Celanese Shares to the Frankfurt Stock Exchange, the squeeze-out and the potential conversion of Celanese AG from its current legal form of a stock corporation into a limited partnership (Kommanditgesellschaft, KG) or a limited liability company (Gesellschaft mit beschränkter Haftung, GmbH) in accordance with the provisions of the German Transformation Act (Umwandlungsgesetz, UmwG). Minority shareholders may be able to delay or prevent the implementation of Celanese AG's corporate actions irrespective of the size of their shareholding. Any challenge by minority shareholders to the validity of a corporate action may be subject to judicial resolution that may substantially delay or hinder the implementation of such action. Such delays of, or interferences with, corporate actions as well as related litigation may limit our access to Celanese AG's cash flows and make it difficult or impossible for us to take or implement corporate actions which may be desirable in view of our operating or financial requirements, including actions which may have beneficial effects for our common stockholders.

        Celanese AG's board of management may refuse to comply with instructions given by the Purchaser pursuant to the Domination Agreement, which may prevent us from causing Celanese AG to take actions which may have beneficial effects for our shareholders.

        Under the Domination Agreement, the Purchaser is entitled to give instructions directly to the board of management of Celanese AG, including, but not limited to, instructions that are disadvantageous to Celanese AG, as long as such disadvantageous instructions benefit the Purchaser or the companies affiliated with either the Purchaser or Celanese AG. Celanese AG's board of management is required to comply with any such instruction, unless, at the time when such instruction is given, (i) it is, in the opinion of the board of management of Celanese AG, obviously not in the interests of the Purchaser or the companies affiliated with either the Purchaser or Celanese AG, (ii) in the event of a disadvantageous instruction, the negative consequences to Celanese AG are disproportionate to the benefits to the Purchaser or the companies affiliated with either the Purchaser or Celanese AG, (iii) compliance with the instruction would violate legal or statutory restrictions, (iv) compliance with the instruction would endanger the existence of Celanese AG or (v) it is doubtful whether the Purchaser will be able to fully compensate Celanese AG, as required by the Domination Agreement, for its annual loss (Jahresfehlbetrag) incurred during the fiscal year in which such instruction is given. The board of management of Celanese AG remains ultimately responsible for making the executive decisions for Celanese AG and the Purchaser, despite the Domination Agreement, is not entitled to act on behalf of, and has no power to legally bind, Celanese AG. The Celanese AG board of management may delay the implementation of, or refuse to implement, any of the Purchaser's instructions despite its general obligation to follow such instructions (with the exceptions mentioned above). Such delays of, or interferences with, compliance with the Purchaser's instructions by the board of management of Celanese AG may make it difficult or impossible for the Purchaser to implement corporate actions which may be desirable in view of our operating or financial requirements, including actions which may have beneficial effects for our common stockholders.

        The Purchaser will be required to ensure that Celanese AG pays a guaranteed fixed annual payment to the minority shareholders of Celanese AG, which may reduce the funds the Purchaser can otherwise make available to us.

        As long as the Purchaser does not own 100% of the outstanding Celanese Shares, the Domination Agreement requires, among other things, the Purchaser to ensure that Celanese AG makes a gross guaranteed fixed annual payment (Ausgleich) to minority shareholders of €3.27 per Celanese share less certain corporate taxes in lieu of any future dividend. Taking into account the circumstances and the tax rates at the time of the entering into of the Domination Agreement, the net guaranteed fixed annual payment is €2.89 per share for a full fiscal year. As of October 29,December 6, 2004, there were 7,951,4827,953,907 Celanese Shares held by minority shareholders. The net guaranteed fixed annual payment may, depending on applicable corporate tax rates, in the future be higher, lower or the same as €2.89. The amount of this

amount of this guaranteed fixed annual payment was calculated in accordance with applicable German law. The amount of the payment is currently under review in special award proceedings (Spruchverfahren). See "Business—Legal Proceedings." Such guaranteed fixed annual payments will be required regardless of whether the actual distributable profits per share of Celanese AG are higher, equal to, or lower than the amount of the guaranteed fixed annual payment per share. The guaranteed fixed annual payment will be payable for so long as there are minority shareholders of Celanese AG and the Domination Agreement remains in place. No dividends for the period after effectiveness of the Domination Agreement, other than the guaranteed fixed annual payment effectively paid by the Purchaser, are expected to be paid by Celanese AG. These requirements may reduce the funds the Purchaser can make available to the Issuer and its subsidiaries and, accordingly, diminish our ability to make payments, on our respective indebtedness. See "The Transactions—Post-Tender Offer Events—Domination and Profit and Loss Transfer Agreement."

        The amounts of the fair cash compensation and of the guaranteed fixed annual payment offered under the Domination Agreement may be increased, which may further reduce the funds the Purchaser can otherwise make available to us.

        As of the date of this prospectus, several minority shareholders of Celanese AG have initiated special award proceedings (Spruchverfahren) seeking the court's review of the amounts of the fair cash compensation (Abfindung) and of the guaranteed fixed annual payment (Ausgleich) offered under the Domination Agreement. So far, pleadings by several minority shareholders have been served on the Purchaser. As a result of these proceedings, the amounts of the fair cash compensation (Abfindung) and of the guaranteed fixed annual payment (Ausgleich) could be increased by the court. Any such increase may be substantial. All minority shareholders including those who have already received the fair cash compensation would be entitled to claim the respective higher amounts. This may reduce the funds the Purchaser can make available to the Issuer and its subsidiaries and, accordingly, diminish our ability to make payments on our indebtedness. See "Business—Legal Proceedings."

        The Purchaser may be required to compensate Celanese AG for annual losses, which may reduce the funds the Purchaser can otherwise make available to the Issuer.

        Under the Domination Agreement, the Purchaser is required, among other things, to compensate Celanese AG for any annual loss incurred, determined in accordance with German accounting requirements, by Celanese AG at the end of the fiscal year in which the loss was incurred. This obligation to compensate Celanese AG for annual losses will apply during the entire term of the Domination Agreement. If Celanese AG incurs losses during any period of the operative term of the Domination Agreement and if such losses lead to an annual loss of Celanese AG at the end of any given fiscal year during the term of the Domination Agreement, the Purchaser will be obligated to make a corresponding cash payment to Celanese AG to the extent that the respective annual loss is not fully compensated for by the dissolution of profit reserves (Gewinnrücklagen) accrued at the level of Celanese AG during the term of the Domination Agreement. The Purchaser may be able to reduce or avoid cash payments to Celanese AG by off-setting against such loss compensation claims by Celanese AG any valuable counterclaims against Celanese AG that the Purchaser may have. If the Purchaser was obligated to make cash payments to Celanese AG to cover an annual loss, we may not have sufficient funds to make payments on our indebtedness when due and, unless the Purchaser is able to obtain funds from a source other than annual profits of Celanese AG, the Purchaser may not be able to satisfy its obligation to fund such shortfall. See "The Transactions—Post-Tender Offer Events—Domination and Profit and Loss Transfer Agreement."

        Two of our subsidiaries have agreed to guarantee the Purchaser's obligation under the Domination Agreement, which may diminish our ability to make payments on our indebtedness.

        Our subsidiaries, BCP Caylux Holdings Luxembourg S.C.A. and BCP Crystal, have each agreed to provide the Purchaser with financing to strengthen the Purchaser's ability to fulfill its obligations under,

or in connection with, the Domination Agreement and to ensure that the Purchaser will perform all of its obligations under, or in connection with, the Domination Agreement when such obligations become due, including, without limitation, the obligations to make a guaranteed fixed annual payment to the outstanding minority shareholders, to offer to acquire all outstanding Celanese Shares from the minority shareholders in return for payment of fair cash consideration and to compensate Celanese AG for any annual loss incurred by Celanese AG during the term of the Domination Agreement. If BCP Caylux Holdings Luxembourg S.C.A. and/or BCP Crystal are obligated to make payments under such guarantees or other security to the Purchaser and/or the minority shareholders, we may not have sufficient funds for payments on our indebtedness when due.

        Even if the minority shareholders' challenges to the Domination Agreement are unsuccessful and the Domination Agreement continues to be operative, we may not be able to receive distributions from Celanese AG sufficient to pay our obligations.

        Even if the minority shareholders' challenges to the Domination Agreement are unsuccessful and the Domination Agreement continues to be operative, we are limited in the amount of distributions we may receive in any year from Celanese AG. Under German law, the amount of distributions to the Purchaser will be determined based on the amount of unappropriated earnings generated during the term of the Domination Agreement as shown in the unconsolidated annual financial statements of Celanese AG, prepared in accordance with German accounting principles and as adopted and approved by resolutions of the Celanese AG board of management and supervisory board, which financial statements may be different from Celanese's consolidated financial statements under U.S. GAAP. Our share of these earnings, if any, may not be in amounts and at times sufficient to allow us to pay our indebtedness as it becomes due, which could have a material adverse effect on the value of the common stock.

        Certain of our subsidiaries must rely on payments from their own subsidiaries to fund payments on their indebtedness. Such funds may not be available in certain circumstances.

        Our subsidiaries, BCP Crystal and Crystal US Holdings 3 L.L.C. ("Crystal LLC"), are holding companies and all of their operations are conducted through their subsidiaries. Therefore, they depend on the cash flow of their subsidiaries, including Celanese, to meet their obligations, including obligations of approximately $2.6$2.8 billion (after giving effect to the Transactions, the Recent Restructuring and this offering, including the application of the estimated net proceeds therefrom)Concurrent Financings) of our indebtedness. If the Domination Agreement ceases to be operative, such subsidiaries may be unable to meet their obligations under such indebtedness. Although the Domination Agreement became operative on October 1, 2004, it is subject to legal challenges instituted by dissenting shareholders. In August 2004, minority shareholders filed nine actions against Celanese AG in the Frankfurt District Court (Landgericht) seeking, among other things, to set aside the shareholder resolutions passed at the extraordinary general meeting held on July 30 and 31, 2004 based, among other things, on the alleged violation of procedural requirements and information rights of the shareholders, to declare the Domination Agreement and the change in the fiscal year void and to prohibit Celanese AG from performing its obligations under the Domination Agreement. Pursuant to German law, the time period for the filing of such challenges has expired. Further, two additional minority shareholders have joined the proceedings via third party intervention in support of the plaintiffs. The Purchaser has joined the proceedings via third party intervention to support Celanese AG. In addition, a German court could revoke the registration of the Domination Agreement in the commercial register. On August 2, 2004, two minority shareholders instituted public register proceedings with the Königstein Local Court (Amtsgericht) and the Frankfurt District Court, both with a view to have the registration of the Domination Agreement in the Commercial Register deleted (Amtslöschungsverfahren). See "Business—Legal Proceedings."

        The ability of the subsidiaries of BCP Crystal and Crystal LLC to make distributions to BCP Crystal and Crystal LLC by way of dividends, interest, return on investments, or other payments (including

(including loans) or distributions is subject to various restrictions, including restrictions imposed by the senior credit facilities and indentures governing their indebtedness, and future debt may also limit or prohibit such payments. In addition, the ability of the subsidiaries to make such payments may be limited by relevant provisions of German and other applicable laws.

Risks Related to Our Indebtedness

        Our high level of indebtedness could diminish our ability to raise additional capital to fund our operations, limit our ability to react to changes in the economy or the chemicals industry and prevent us from meeting obligations under our indebtedness.

        We are highly leveraged. On a pro forma basis as of JuneSeptember 30, 2004 after giving effect to the Transactions, the Recent Restructuring and this offering, including the application of the estimated net proceeds therefrom,Concurrent Financings, our total debt would have been $2,986$3,217 million. See "Capitalization" for additional information.

        Our substantial debt could have important consequences for you, including:

•

making it more difficult for us to make payments on our debt;



•

increasing vulnerability to general economic and industry conditions;



•

requiring a substantial portion of cash flow from operations to be dedicated to the payment of principal and interest on indebtedness, therefore reducing our ability to use Celanese's cash flow to fund operations, capital expenditures and future business opportunities;



•

exposing us to the risk of increased interest rates as certain of our borrowings, including the floating rate term loan and borrowings under the senior credit facilities, are at variable rates of interest;



•

limiting our ability to obtain additional financing for working capital, capital expenditures, product development, debt service requirements, acquisitions and general corporate or other purposes; and



•

limiting our ability to adjust to changing market conditions and placing us at a competitive disadvantage compared to our competitors who have less debt.

        Despite our current high leverage, we and our subsidiaries may be able to incur substantially more debt. This could further exacerbate the risks of our high leverage.

        We may be able to incur substantial additional indebtedness in the future. The terms of our existing debt do not fully prohibit us from doing so. The revolving credit facilities provide commitments of up to $608$611 million. As of October 28,December 6, 2004, there were no outstanding borrowings under the revolving credit facilities and availability of $414$405 million (taking into account letters of credit issued under the revolving credit facilities). In addition, upon the occurrence of certain events, we may request an increase to the existing term loan facility in an amount not to exceed $175 million in the aggregate, subject to receipt of commitments by existing term loan lenders or other financial institutions reasonably acceptable to the administrative agent. If new debt is added to our current debt levels, the related risks that we now face could intensify.

        We may not be able to generate sufficient cash to service our indebtedness, and may be forced to take other actions to satisfy obligations under our indebtedness, which may not be successful.

        Our ability to satisfy our cash needs depends on cash on hand, receipt of additional capital, including possible additional borrowings, and receipt of cash from our subsidiaries by way of

distributions, advances or cash payments. On a pro forma basis at JuneSeptember 30, 2004, giving pro forma effect to this offering and the use of proceeds as described under "Use of Proceeds,Concurrent Financings," we had $2,982$3,215 million of total indebtedness. Debt service requirements consist of principal repayments aggregating $202$260 million in the next five years and $2,907

$3,176 million thereafter (including $127$221 million of accreted value on the senior discount notes) and annual cash interest payments in excess of $200approximately $170 million in each of the next five years. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Contractual Obligations."

        Our ability to make scheduled payments on or to refinance our debt obligations depends on the financial condition and operating performance of our subsidiaries, which is subject to prevailing economic and competitive conditions and to certain financial, business and other factors beyond our control. We may not be able to maintain a level of cash flows from operating activities sufficient to permit us to pay the principal, premium, if any, and interest on our indebtedness.

        If our cash flows and capital resources are insufficient to fund our debt service obligations, we may be forced to reduce or delay capital expenditures, sell assets (including the Celanese Shares), seek additional capital or restructure or refinance our indebtedness. These alternative measures may not be successful and may not permit us to meet our scheduled debt service obligations. In the absence of such operating results and resources, we could face substantial liquidity problems and might be required to dispose of material assets or operations to meet our debt service and other obligations. The senior credit facilities and the indentures governing our indebtedness restrict our ability to dispose of assets and use the proceeds from the disposition. We may not be able to consummate those dispositions or to obtain the proceeds which we could realize from them and these proceeds may not be adequate to meet any debt service obligations then due.

        Restrictive covenants in our debt instruments may limit our ability to engage in certain transactions and may diminish our ability to make payments on our indebtedness.

        The senior credit facilities, the floating rate term loan and the indentures governing our indebtedness contain various covenants that limit our ability to engage in specified types of transactions. These covenants limit the ability of Crystal LLC, BCP Crystal and their restricted subsidiaries to, among other things, incur additional indebtedness or issue preferred stock, pay dividends on or make other distributions on or repurchase their capital stock or make other restricted payments, make investments, and sell certain assets.

        In addition, the senior credit facilities contain covenants that require Celanese Holdings LLC ("Celanese Holdings") to maintain specified financial ratios and satisfy other financial condition tests. Celanese Holdings' ability to meet those financial ratios and tests can be affected by events beyond its control, and it may not be able to meet those tests at all. A breach of any of these covenants could result in a default under the senior credit facilities. Upon the occurrence of an event of default under the senior credit facilities, the lenders could elect to declare all amounts outstanding under the senior credit facilities to be immediately due and payable and terminate all commitments to extend further credit. If Celanese Holdings were unable to repay those amounts, the lenders under the senior credit facilities could proceed against the collateral granted to them to secure that indebtedness. Celanese Holdings has pledged a significant portion of its assets as collateral under the senior credit facilities. If the lenders under the senior credit facilities accelerate the repayment of borrowings, Celanese Holdings may not have sufficient assets to repay the senior credit facilities and its other indebtedness, which could have a material adverse effect on the value of our common stock.

        The terms of the senior credit facilities prohibit BCP Crystal and its subsidiaries from paying dividends or otherwise transferring their assets to us.

        Our operations are conducted through our subsidiaries and our ability to pay dividends is dependent on the earnings and the distribution of funds from our subsidiaries. However, the terms of the senior credit facilities prohibit BCP Crystal and its subsidiaries from paying dividends or otherwise transferring their assets to us. Accordingly, under the terms of the senior credit facilities, BCP Crystal and its subsidiaries may not make dividends to us to enable us to pay dividends on our common stock.

Risks Related to Our Business

        We are an international company and are exposed to general economic, political and regulatory conditions and risks in the countries in which we have significant operations.

        We operate in the global market and have customers in many countries. We have major facilities located in North America, Europe and Asia, including facilities in Germany, China, Japan, Korea and Saudi Arabia operated through joint ventures. Our principal customers are similarly global in scope, and the prices of our most significant products are typically world market prices. Consequently, our business and financial results are affected directly and indirectly by world economic, political and regulatory conditions.

        Conditions such as the uncertainties associated with war, terrorist activities, epidemics, pandemics or political instability in any of the countries in which we operate could affect us by causing delays or losses in the supply or delivery of raw materials and products as well as increased security costs, insurance premiums and other expenses. These conditions could also result in or lengthen economic recession in the United States, Europe, Asia or elsewhere. Moreover, changes in laws or regulations, such as unexpected changes in regulatory requirements (including import or export licensing requirements), or changes in the reporting requirements of United States, German or European Union governmental agencies, could increase the cost of doing business in these regions. Any of these conditions may have an effect on our business and financial results as a whole and may result in volatile current and future prices for our securities, including the common stock.

        Cyclicality in the industrial chemicals industry has in the past and may in the future result in reduced operating margins or in operating losses.

        Consumption of the basic chemicals that we manufacture, in particular those in acetyl products, such as methanol, formaldehyde, acetic acid and vinyl acetate monomer, has increased significantly over the past 30 years. Despite this growth in consumption, producers have experienced alternating periods of inadequate capacity and excess capacity for these products. Periods of inadequate capacity, including some due to raw material shortages, have usually resulted in increased selling prices and operating margins. This has often been followed by periods of capacity additions, which have resulted in declining capacity utilization rates, selling prices and operating margins.

        We expect that these cyclical trends in selling prices and operating margins relating to capacity shortfalls and additions will likely persist in the future, principally due to the continuing combined impact of five factors:

•

Significant capacity additions, whether through plant expansion or construction, can take two to three years to come on stream and are therefore necessarily based upon estimates of future demand.



•

When demand is rising, competition to build new capacity may be heightened because new capacity tends to be more profitable, with a lower marginal cost of production. This tends to amplify upswings in capacity.

•

When demand is falling, the high fixed cost structure of the capital-intensive chemicals industry leads producers to compete aggressively on price in order to maximize capacity utilization.

•

As competition in these products is focused on price, being a low-cost producer is critical to profitability. This favors the construction of larger plants, which maximize economies of scale, but which also lead to major increases in capacity that can outstrip current growth in demand.



•

Cyclical trends in general business and economic activity produce swings in demand for chemicals.

        We believe that the basic chemicals industry, particularly in the commodity chemicals manufactured by our Chemical Products segment, is currently characterized by overcapacity, and that there may be further capacity additions in the next few years.

        The length and depth of product and industry business cycles of our markets, particularly in the automotive, electrical, construction and textile industries, may result in reduced operating margins or in operating losses.

        Some of the markets in which our customers participate, such as the automotive, electrical, construction and textile industries, are cyclical in nature, thus posing a risk to us which is beyond our control. These markets are highly competitive, to a large extent driven by end-use markets, and may experience overcapacity, all of which may affect demand for and pricing of our products.

        We are subject to risks associated with the increased volatility in raw materials prices and the availability of key raw materials.

        We purchase significant amounts of natural gas, ethylene, butane, and propylene from third parties for use in our production of basic chemicals in the Chemical Products segment, principally methanol, formaldehyde, acetic acid, vinyl acetate monomer, as well as oxo products. We use a portion of our output of these chemicals, in turn, as inputs in the production of further products in all our segments. We also purchase significant amounts of cellulose or wood pulp for use in our production of cellulose acetate in the Acetate Products segment. We purchase significant amounts of natural gas, electricity, coal and fuel oil to supply the energy required in our production processes.

        Prices of natural gas, oil and other hydrocarbons have increased dramatically in 2004. To the extent this trend continues and we are unable to pass through these price increases to our customers, our operating profit and results of operations may be less favorable than expected.

        We are exposed to any volatility in the prices of our raw materials and energy. Although we have agreements providing for the supply of natural gas, ethylene, propylene, wood pulp, electricity, coal and fuel oil, the contractual prices for these raw materials and energy vary with market conditions and may be highly volatile. Factors which have caused volatility in our raw material prices in the past and which may do so in the future include:

•

Shortages of raw materials due to increasing demand, e.g., from growing uses or new uses;



•

Capacity constraints, e.g., due to construction delays, strike action or involuntary shutdowns;



•

The general level of business and economic activity; and



•

The direct or indirect effect of governmental regulation.

        We strive to improve profit margins of many of our products through price increases when warranted and accepted by the market; however, our operating margins may decrease if we cannot pass on increased raw material prices to customers, or we may not be able to capture the benefit of raw material price declines if raw material prices fall to levels below those at which we are committed to purchase under forward purchase contracts. Even in periods during which raw material prices decline,

we may suffer decreasing operating profit margins if raw material price reductions occur at a slower rate than decreases in the selling prices of our products.

        A substantial portion of our products and raw materials are commodities whose prices fluctuate as market supply/demand fundamentals change. We manage our exposure through the use of derivative instruments and forward purchase contracts for commodity price hedging, entering into long-term

supply agreements, and multi-year purchasing and sales agreements. Our policy, for the majority of our natural gas and butane requirements, allows entering into supply agreements and forward purchase or cash-settled swap contracts, generally for up to 24 months. During the first sixnine months of 2004, we did not enter into any forward contracts for our butane requirements and, for natural gas, had positions covering about 35% of our North American Chemical Products segment requirements primarily as a result of forward contracts entered into in 2003. In the future, we may modify our practice of purchasing a portion of our commodity requirements forward, and consider utilizing a variety of other raw material hedging instruments in addition to forward purchase contracts in accordance with changes in market conditions. As these forward contracts expire, we may be exposed to future price fluctuations if the forward purchase contracts are not replaced, or if we elect to replace them, we may have to do so at higher costs. Although we seek to offset increases in raw material prices with corresponding increases in the prices of our products, we may not be able to do so, and there may be periods when such product price increases lag behind raw material cost increases.

        We have a policy of maintaining, when available, multiple sources of supply for raw materials. However, some of our individual plants may have single sources of supply for some of their raw materials, such as carbon monoxide and acetaldehyde. We may not be able to obtain sufficient raw materials due to unforeseen developments that would cause an interruption in supply. Even if we have multiple sources of supply for a raw material, these sources may not make up for the loss of a major supplier. Nor can there be any guarantee that profitability will not be affected should we be required to qualify additional sources of supply in the event of the loss of a sole or a major supplier.

        Failure to develop new products and production technologies or to implement productivity and cost reduction initiatives successfully may harm our competitive position.

        Our operating results, especially in our Performance Products and Technical Polymers Ticona segments, depend significantly on the development of commercially viable new products, product grades and applications, as well as production technologies. If we are unsuccessful in developing new products, applications and production processes in the future, our competitive position and operating results will be negatively affected. Likewise, we have undertaken and are continuing to undertake initiatives in all segments to improve productivity and performance and to generate cost savings. These initiatives may not be completed or beneficial or the estimated cost savings from such activities may not be realized.

        Frankfurt airport expansion could require us to reduce production capacity of, limit expansion potential of, or incur relocation costs for our Kelsterbach plant which would lead to significant additional costs.

        The Frankfurt airport's expansion plans include the construction of an additional runway. One of the three sites under consideration, the northwest option, would be located in close proximity to our Kelsterbach production plant. The construction of this particular runway could have a negative effect on the plant's current production capacity and future development. While the government of the state of Hesse and the owner of the Frankfurt airport promote the expansion of the northwest option, it is uncertain whether this option is in accordance with applicable laws. Although the government of the state of Hesse expects the plan approval for the airport expansion in 2007 and the start of operations in 2009-2010, neither the final outcome of this matter nor its timing can be predicted at this time.

        Environmental regulations and other obligations relating to environmental matters could subject us to liability for fines, clean-ups and other damages, require us to incur significant costs to modify our operations and increase our manufacturing and delivery costs.

        Costs related to our compliance with environmental laws concerning, and potential obligations with respect to, contaminated sites may have a significant negative impact on our operating results. These include obligations related to sites currently or formerly owned or operated by us, or where waste from our operations was disposed. We also have obligations related to the indemnity agreement contained in the demerger and transfer agreement between Celanese and Hoechst, also referred to as the demerger agreement, for environmental matters arising out of certain divestitures that took place prior to the demerger. Our accruals for environmental remediation obligations, $159 million as of December 31,

2003, may be insufficient if the assumptions underlying those accruals prove incorrect or if we are held responsible for currently undiscovered contamination. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates—Environment Liabilities," notes 23 and 24 to the Celanese Consolidated Financial Statements and note 12 to the Issuer Interim Consolidated Financial Statements.

        Our operations are subject to extensive international, national, state, local, and other supranational laws and regulations that govern environmental and health and safety matters. We incur substantial capital and other costs to comply with these requirements. If we violate them, we can be held liable for substantial fines and other sanctions, including limitations on our operations as a result of changes to or revocations of environmental permits involved. Stricter environmental, safety and health laws, regulations and enforcement policies could result in substantial costs and liabilities to us or limitations on our operations and could subject our handling, manufacture, use, reuse or disposal of substances or pollutants to more rigorous scrutiny than at present. Consequently, compliance with these laws could result in significant capital expenditures as well as other costs and liabilities and our business and operating results may be less favorable than expected. For example, variousDue to new air regulations in the United States, includingmanagement expects that there will be a temporary increase in compliance costs that will total approximately $30 million to $45 million through 2007. For example, the Miscellaneous Organic National Emissions Standards for Hazardous Air Pollutants (NESHAP) regulations, and various approaches to regulating boilers and incinerators, including the NESHAPs for Industrial/Commercial/Institutional Boilers and Process Heaters, will impose additional requirements on our operations. Although some of these rules have been finalized, a significant portion of the NESHAPs for Industrial/Commercial/Institutional Boilers and Process Heaters regulation that provides for a low risk alternative method of compliance for hydrogen chloride emissions has been challenged in a federal court. We cannot predict the outcome of this challenge, which could, if successful, significantly increase our costcosts by, according to our estimates, approximately $50 million above the $30 to $45 million noted above through 2007 to comply with this regulation. If the challenge is successful, our compliance costs could be substantial. As another example, recent European Union regulations will require a trading system for carbon dioxide emissions to be in place by January 1, 2005. Accordingly, an Emission Trading System has been introduced by German legislation, coming into effect in 2005. This regulation will affect our power plants at the Kelsterbach, Oberhausen and Lanaken sites, as well as power plants operated by InfraServ entities. The InfraServ entities may be required to purchase carbon dioxide credits, which could result in increased operating costs, or may be required to develop additional cost-effective methods to reduce carbon dioxide emissions further, which could result in increased capital expenditures.

        We are also involved in several claims, lawsuits and administrative proceedings relating to environmental matters. An adverse outcome in any of them may negatively affect our earnings and cash flows in a particular reporting period.

        Changes in environmental, health and safety regulatory requirements could lead to a decrease in demand for our products.

        New or revised governmental regulations relating to health, safety and the environment may also affect demand for our products.

        Pursuant to the European Union regulation on Risk Assessment of Existing Chemicals, the European Chemicals Bureau of the European Commission has been conducting risk assessments on approximately 140 major chemicals. Some of the chemicals initially being evaluated include vinyl acetate monomer or VAM, which we produce. These risk assessments entail a multi-stage process to determine to what extent the European Commission should classify the chemical as a carcinogen and, if so, whether this classification and related labeling requirements should apply only to finished products that contain specified threshold concentrations of a particular chemical. In the case of VAM, we currently do not expect a final ruling is not expected until the end of 2004.mid-2005. We and other VAM producers are participating in this process with detailed scientific analyses supporting the industry's position that VAM is not a

probable human carcinogen and that labeling of final products should not be required. If labeling is required, then it should depend on relatively high parts per million of residual VAM in these end products. We cannot predict the outcome or effect of any final ruling.

        Several recent studies have investigated possible links between formaldehyde exposure and various end points including leukemia. The International Agency for Research on Cancer or IARC recently reclassified formaldehyde from Group 2A (probable human carcinogen) to Group 1 (known human carcinogen) based on studies linking formaldehyde exposure to nasopharyngeal cancer, a rare cancer in humans. IARC also concluded that there is insufficient evidence for a causal association between leukemia and occupational exposure to formaldehyde, although it also characterized evidence for such an association as strong. The results of IARC's review will be examined by government agencies with responsibility for setting worker and environmental exposure standards and labeling requirements. We are a producer of formaldehyde and plastics derived from formaldehyde. We are participating together with other producers and users in the evaluations of these findings. We cannot predict the final effect of IARC's reclassification.

        Other recent initiatives will potentially require toxicological testing and risk assessments of a wide variety of chemicals, including chemicals used or produced by us. These initiatives include the Voluntary Children's Chemical Evaluation Program and High Production Volume Chemical Initiative in the United States, as well as various European Commission programs, such as the new European Environment and Health Strategy, commonly known as SCALE, as well as the Proposal for the Registration, Evaluation, Authorization and Restriction of Chemicals or REACH. REACH, which the European Commission proposed in October 2003, will establish a system to register and evaluate chemicals manufactured in, or imported to, the European Union. Depending on the final ruling, additional testing, documentation and risk assessments will occur for the chemical industry. This will affect European producers of chemicals as well as all chemical companies worldwide that export to member states of the European Union. The final ruling has not yet been decided.

        The above-mentioned assessments in the United States and Europe may result in heightened concerns about the chemicals involved, and in additional requirements being placed on the production, handling, labeling or use of the subject chemicals. Such concerns and additional requirements could increase the cost incurred by our customers to use our chemical products and otherwise limit the use of these products, which could lead to a decrease in demand for these products.

        Our production facilities handle the processing of some volatile and hazardous materials that subject it to operating risks that could have a negative effect on its operating results.

        Our operations are subject to operating risks associated with chemical manufacturing, including the related storage and transportation of raw materials, products and wastes. These hazards include, among other things:

•

pipeline and storage tank leaks and ruptures;



•

explosions and fires; and



•

discharges or releases of toxic or hazardous substances.

        These operating risks can cause personal injury, property damage and environmental contamination, and may result in the shutdown of affected facilities and the imposition of civil or criminal penalties. The occurrence of any of these events may disrupt production and have a negative effect on the productivity and profitability of a particular manufacturing facility and our operating results and cash flows.

        We maintain property, business interruption and casualty insurance which we believe is in accordance with customary industry practices, but we cannot predict whether this insurance will be adequate to fully cover all potential hazards incidental to our business. We have established two captive insurance subsidiaries (Captives) that provide a portion of the total insurance coverage to us for certain of our lower tier property and casualty risks. They additionally provide coverage to third parties for

their higher tier risk programs. If there were concurrent claims made on all policies issued by the Captives, sufficient capital may not be available for them to satisfy all claims against all such policies. As of September 30, 2004, the net retained concurrent aggregate risk of all policies written by the Captives, after reinsuring higher tier risks with third party insurance companies, net of established reserves, amounted to approximately $516 million. This amount of exposure is further offset by the underlying equity of the Captives amounting to approximately $370 million at September 30, 2004.

        Our significant non-U.S. operations expose us to global exchange rate fluctuations that could impact our profitability.

        We are exposed to market risk through commercial and financial operations. Our market risk consists principally of exposure to fluctuations in currency exchange and interest rates.

        As we conduct a significant portion of our operations outside the United States, fluctuations in currencies of other countries, especially the euro, may materially affect our operating results. For example, changes in currency exchange rates may affect:

•

The relative prices at which we and our competitors sell products in the same market; and



•

The cost of items required in our operations.

        We use financial instruments to hedge our exposure to foreign currency fluctuations. More than 90% of outstanding foreign currency contracts are used to hedge the foreign currency denominated intercompany net receivables. The net notional amounts under such foreign currency contracts outstanding at December 31, 2003 were $765 million. The hedging activity of foreign currency denominated intercompany net receivables resulted in a cash inflow of approximately $180 million in 2003. These positive effects may not be indicative of future effects.

        A substantial portion of our net sales is denominated in currencies other than the U.S. dollar. In our consolidated financial statements, we translate our local currency financial results into U.S. dollars based on average exchange rates prevailing during a reporting period or the exchange rate at the end of that period. During times of a strengthening U.S. dollar, at a constant level of business, our reported international sales, earnings, assets and liabilities will be reduced because the local currency will translate into fewer U.S. dollars. We estimate that the translation effects of changes in the value of other currencies against the U.S. dollar increased net sales by approximately 3%4% for the sixnine months ended JuneSeptember 30, 2004, and7% for the year ended December 31, 2003 and increased net sales by approximately 2% in 2002. We estimate that the translation effects of changes in the value of other currencies against the U.S. dollar decreasedhad minimal impact on total assets by 1% for the sixnine months ended JuneSeptember 30, 2004 and increased total assets by approximately 5% in 2003.

        In addition to currency translation risks, we incur a currency transaction risk whenever one of our operating subsidiaries enters into either a purchase or a sales transaction using a different currency from the currency in which we receive revenues. Given the volatility of exchange rates, we may not be able to manage our currency transaction and/or translation risks effectively, or volatility in currency exchange rates may expose our financial condition or results of operations to a significant additional risk. Since a significant portion of our indebtedness is and will be denominated in U.S. dollars, a strengthening of the U.S. dollar could make it more difficult for us to repay our indebtedness.

        Significant changes in pension fund investment performance or assumptions relating to pension costs may have a material effect on the valuation of pension obligations, the funded status of pension plans, and our pension cost.

        Our funding policy for pension plans is to accumulate plan assets that, over the long run, will approximate the present value of projected benefit obligations. Our pension cost is materially affected by the discount rate used to measure pension obligations, the level of plan assets available to fund those obligations at the measurement date and the expected long-term rate of return on plan assets. Significant changes in investment performance or a change in the portfolio mix of invested assets can result in corresponding increases and decreases in the valuation of plan assets, particularly equity

securities, or in a change of the expected rate of return on plan assets. A change in the discount rate would result in a significant increase or decrease in the valuation of pension obligations, affecting the reported funded status of our pension plans as well as the net periodic pension cost in the following fiscal years. Similarly, changes in the expected return on plan assets can result in significant changes in the net periodic pension cost of the following fiscal years. As of December 31, 2003, our underfunded position related to our defined benefit pension plans was $879 million. During 2004, we voluntarily contributed approximately $457 million to the plans. In 2004, no funding is statutorily required for any of our sponsored plans.

        We have preliminarily recorded a significant amount of goodwill and other identifiable intangible assets, and we may never realize the full value of our intangible assets.

        In connection with the Transactions, we have recorded a significant amount of goodwill and other identifiable intangible assets. Goodwill and other net identifiable intangible assets were approximately $856$934 million as of JuneSeptember 30, 2004, or 12%13% of our total assets based on preliminary purchase accounting. Goodwill and net identifiable intangible assets are recorded at fair value on the date of acquisition and, in accordance with Financial Accounting Standards Board Statement of Financial Accounting Standards ("SFAS") No. 142, Goodwill and Other Intangible Assets, will be reviewed at least annually for impairment. Impairment may result from, among other things, deterioration in our performance, adverse market conditions, adverse changes in applicable laws or regulations, including changes that restrict the activities of or affect the products and services sold by our business, and a variety of other factors. The amount of any quantified impairment must be expensed immediately as a charge to results of operations. Depending on future circumstances, it is possible that we may never realize the full value of our intangible assets. Any future determination of impairment of a significant portion of goodwill or other identifiable intangible assets would have an adverse effect on our financial condition and results of operations.

Celanese may be required to make payments to Hoechst.

        Under its 1999 demerger agreement with Hoechst, Celanese agreed to indemnify Hoechst for environmental liabilities that Hoechst may incur with respect to Celanese's German production sites, which were transferred from Hoechst to Celanese in connection with the demerger. Celanese also has an obligation to indemnify Hoechst against liabilities for environmental damages or contamination arising under certain divestiture agreements entered into by Hoechst prior to the demerger. As the indemnification obligations depend on the occurrence of unpredictable future events, the costs associated with them are not yet determinable and may materially affect operating results.

        Celanese's obligation to indemnify Hoechst against liabilities for environmental contamination in connection with the divestiture agreements is subject to the following thresholds (translated into U.S. dollars using the December 31, 2003 exchange rate):

•

Celanese will indemnify Hoechst for the total amount of these liabilities up to €250 million (approximately $315 million);



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Hoechst will bear the full amount of those liabilities between €250 million (approximately $315 million) and €750 million (approximately $950 million); and

•

Celanese will indemnify Hoechst for one third of those liabilities for amounts exceeding €750 million (approximately $950 million).

        Celanese has made payments through December 31, 2003 of $35 million for environmental contamination liabilities in connection with the divestiture agreements, and may be required to make additional payments in the future. As of December 31, 2003, we have reserves of approximately $53 million for this contingency, and may be required to record additional reserves in the future.

        Also, Celanese has undertaken in the demerger agreement to indemnify Hoechst to the extent that Hoechst is required to discharge liabilities, including tax liabilities, in relation to assets included in the

demerger, where such liabilities have not been demerged due to transfer or other restrictions. Celanese has not made any payments to Hoechst in 2004 and did not make any payments in either 2003 or 2002 in connection with this indemnity.

        Under the demerger agreement, Celanese will also be responsible, directly or indirectly, for all of Hoechst's obligations to past employees of businesses that were demerged to Celanese. Under the demerger agreement, Hoechst agreed to indemnify Celanese from liabilities (other than liabilities for environmental contamination) stemming from the agreements governing the divestiture of Hoechst's polyester businesses, which were demerged to Celanese, insofar as such liabilities relate to the European part of that business. Hoechst has also agreed to bear 80 percent of the financial obligations arising in connection with the government investigation and litigation associated with the sorbates industry for price fixing described in "Business—Legal Proceedings—Sorbates Antitrust Actions" and note 23 to the Celanese Consolidated Financial Statements and note 1213 to the Interim Consolidated Financial Statements, and Celanese has agreed to bear the remaining 20 percent.

        Our variable rate indebtedness subjects us to interest rate risk, which could cause our debt service obligations to increase significantly and affect our operating results.

        Certain of our borrowings, primarily borrowings under the senior credit facilities, are at variable rates of interest and expose us to interest rate risk. If interest rates increase, which we expect to occur, our debt service obligations on the variable rate indebtedness would increase even though the amount borrowed remained the same, and our net income and cash available for servicing our indebtedness would decrease. On a pro forma basis as of JuneSeptember 30, 2004, we had $1,047$1,656 million of variable rate debt. A 1% increase in interest rates would increase annual interest expense by approximately $10$17 million.

        We may enter into interest rate swap agreements to reduce the exposure of interest rate risk inherent in our debt portfolio. We have, in the past, used swaps for hedging purposes only.

        Because our Sponsor controls us and will continue to control us after this offering, the influence of our public shareholders over significant corporate actions will be limited, and conflicts of interest between our Sponsor and us or you could arise in the future.

        After the consummation of this offering, our Sponsor (as defined in this prospectus) will beneficially own approximately            % of our common stock, or approximately             % of our common stock if the underwriters exercise in full their over-allotment option to purchase additional shares. As a result, our Sponsor has control over our decisions to enter into any corporate transaction and will have the ability to prevent any transaction that requires the approval of equityholders regardless of whether or not other equityholders or noteholders believe that any such transactions are in their own best interests. For example, our Sponsor could cause us to make acquisitions that increase our indebtedness or sell revenue-generating assets. Additionally, our Sponsor is in the business of making investments in companies and may from time to time acquire and hold interests in businesses that compete directly or indirectly with us. Our Sponsor may also pursue acquisition opportunities that may be complementary to our business, and as a result, those acquisition opportunities may not be available to us. So long as our Sponsor continues to own a significant amount of our equity, even if

such amount is less than 50%, it will continue to be able to significantly influence or effectively control our decisions.

        We are a "controlled company" within the meaning of The New York Stock Exchange rules and, as a result, are exempt from certain corporate governance requirements.

        Upon completion of this offering, our Sponsor will continue to control a majority of our outstanding common stock. As a result, we are a "controlled company" within the meaning of the New York Stock Exchange corporate governance standards. Under the New York Stock Exchange rules, a company of which more than 50% of the voting power is held by another company is a "controlled company" and need not comply with certain requirements, including (1) the requirement that a

majority of the board of directors consist of independent directors, (2) the requirement that the nominating committee be composed entirely of independent directors with a written charter addressing the committee's purpose and responsibilities, (3) the requirement that the compensation committee be composed entirely of independent directors with a written charter addressing the committee's purpose and responsibilities and (4) the requirement for an annual performance evaluation of the nominating/corporate governance and compensation committees. Following this offering, we intend to utilize these exemptions. As a result, we will not have a majority of independent directors nor will our nominating and compensation committees consist entirely of independent directors. Accordingly, you will not have the same protections afforded to shareholders of companies that are subject to all of the New York Stock Exchange corporate governance requirements.

        Our future success will depend in part on our ability to protect our intellectual property rights, and our inability to enforce these rights could reduce our ability to maintain our market position and our margins.

        We attach great importance to patents, trademarks, copyrights and product designs in order to protect our investment in research and development, manufacturing and marketing. Our policy is to seek the widest possible protection for significant product and process developments in its major markets. Patents may cover products, processes, intermediate products and product uses. Protection for individual products extends for varying periods in accordance with the date of patent application filing and the legal life of patents in the various countries. The protection afforded, which may also vary from country to country, depends upon the type of patent and its scope of coverage. Our continued growth strategy may bring us to regions of the world where intellectual property protection may be limited and difficult to enforce. We are currently pursuing a number of matters relating to the infringement of our acetic acid patents. If these efforts are unsuccessful, our revenues, results of operations and cash flows in the Chemical Products segment may be adversely affected. Some of our earlier acetic acid patents will expire in 2007; other patents covering acetic acid are presently pending.

        As patents expire, the products and processes described and claimed in those patents become generally available for use by the public. Our European and U.S. patents for making Sunett, an important product in our Performance Products segment, expire in 2005, which will reduce our ability to realize revenues from making Sunett due to increased competition and potential limitations and will result in our results of operations and cash flows relating to the product being less favorable than today.

        We also seek to register trademarks extensively as a means of protecting the brand names of our products, which brand names become more important once the corresponding patents have expired. If we are not successful in protecting our trademark rights, our revenues, results of operations and cash flows may be adversely affected.

Risks Related to this Offering

        There is no existing market for our common stock, and we do not know if one will develop to provide you with adequate liquidity.

        There has not been a public market for the Issuer's common stock. We cannot predict the extent to which investor interest in our company will lead to the development of a trading market on The New York Stock Exchange or otherwise or how liquid that market might become. The initial public offering price for the shares will be determined by negotiations between us and the representative of the underwriters and may not be indicative of prices that will prevail in the open market following this offering.

        Future sales of our shares could depress the market price of our common stock.

        The market price of our common stock could decline as a result of sales of a large number of shares of common stock in the market after the offering or the perception that such sales could occur.

These sales, or the possibility that these sales may occur, also might make it more difficult for us to sell equity securities in the future at a time and at a price that we deem appropriate.

        We, our executive officers and directors and the Original Stockholders have agreed with the underwriters not to sell, dispose of or hedge any shares of our common stock or securities convertible into or exchangeable for shares of our common stock, subject to specified exceptions, during the period from the date of this prospectus continuing through the date that is 180 days after the date of this prospectus, except with the prior written consent of                        .

        After this offering, we will have approximately    million shares of common stock outstanding. Of those shares, the approximately            million shares we are offering will be freely tradeable. The approximately            million shares that were outstanding immediately prior to this offering will be eligible for resale from time to time after the expiration of the 180-day lock-up period, subject to contractual and Securities Act restrictions. None of those shares may be currently resold under Rule 144(k) without regard to volume limitations and approximately            million shares may be sold subject to the volume, manner of sale and other conditions of Rule 144. After the expiration of the 180-day lock-up period, the Original Stockholders, which collectively beneficially own            million shares, will have the ability to cause us to register the resale of their shares.

        The market price of our common stock may be volatile, which could cause the value of your investment to decline.

        Securities markets worldwide experience significant price and volume fluctuations. This market volatility, as well as general economic, market or political conditions, could reduce the market price of the common stock in spite of our operating performance. In addition, our operating results could be below the expectations of public market analysts and investors, and in response, the market price of our common stock could decrease significantly. You may be unable to resell your shares of our common stock at or above the initial public offering price.

        The book value of shares of common stock purchased in the offering will be immediately diluted.

        Investors who purchase common stock in the offering will suffer immediate dilution of $                  per share in the pro forma net tangible book value per share after giving effect to the contemplated use of proceeds from this offering. See "Dilution."

        Provisions in our certificate of incorporation and bylaws, as well as our shareholders' rights plan may discourage a takeover attempt.

        Provisions contained in our certificate of incorporation and bylaws could make it more difficult for a third party to acquire us, even if doing so might be beneficial to our shareholders. Provisions of our certificate of incorporation and bylaws impose various procedural and other requirements, which could

make it more difficult for shareholders to effect certain corporate actions. For example, our certificate of incorporation authorizes our board of directors to determine the rights, preferences, privileges and restrictions of unissued series of preferred stock, without any vote or action by our shareholders. Thus, our board of directors can authorize and issue shares of preferred stock with voting or conversion rights that could adversely affect the voting or other rights of holders of our common stock. These rights may have the effect of delaying or deterring a change of control of our company. In addition, a change of control of our company may be delayed or deterred as a result of our having three classes of directors or as a result of the shareholders' rights plan expected to be adopted by our board of directors prior to the consummation of this offering. These provisions could limit the price that certain investors might be willing to pay in the future for shares of our common stock. See "Description of Capital Stock."

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

        This prospectus contains certain forward-looking statements and information relating to us that are based on the beliefs of our management as well as assumptions made by, and information currently available to, us. These statements include, but are not limited to, statements about our strategies, plans, objectives, expectations, intentions, expenditures, and assumptions and other statements contained in this prospectus that are not historical facts. When used in this document, words such as "anticipate," "believe," "estimate," "expect," "intend," "plan" and "project" and similar expressions, as they relate to us are intended to identify forward-looking statements. These statements reflect our current views with respect to future events, are not guarantees of future performance and involve risks and uncertainties that are difficult to predict. Further, certain forward-looking statements are based upon assumptions as to future events that may not prove to be accurate.

        Many factors could cause our actual results, performance or achievements to be materially different from any future results, performance or achievements that may be expressed or implied by such forward-looking statements. These factors include, among other things:

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changes in general economic, business, political and regulatory conditions in the countries or regions in which we operate;



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the length and depth of product and industry business cycles particularly in the automotive, electrical, electronics, construction and textile industries;



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changes in the price and availability of raw materials, particularly changes in the demand for, supply of, and market prices of fuel oil, natural gas, coal, wood pulp, electricity and petrochemicals such as ethylene, propylene and butane, including changes in production quotas in OPEC countries and the deregulation of the natural gas transmission industry in Europe;



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the ability to pass increases in raw material prices on to customers or otherwise improve margins through price increases;



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the ability to maintain plant utilization rates and to implement planned capacity additions and expansions;



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the ability to reduce production costs and improve productivity by implementing technological improvements to existing plants;



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the existence of temporary industry surplus production capacity resulting from the integration and start-up of new world-scale plants;



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increased price competition and the introduction of competing products by other companies;



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the ability to develop, introduce and market innovative products, product grades and applications, particularly in the Technical Polymers Ticona and Performance Products segments of our business;



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changes in the degree of patent and other legal protection afforded to our products;



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compliance costs and potential disruption or interruption of production due to accidents or other unforeseen events or delays in construction of facilities;



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potential liability for remedial actions under existing or future environmental regulations;



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potential liability resulting from pending or future litigation, or from changes in the laws, regulations or policies of governments or other governmental activities in the countries in which we operate;



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changes in currency exchange rates and interest rates;

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changes in the composition or restructuring of us or our subsidiaries and the successful completion of acquisitions, divestitures and joint venture activities;



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pending or future challenges to the Domination Agreement and continuing access to the cash flows of Celanese AG; and



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various other factors, both referenced and not referenced in this prospectus.

        Many of these factors are macroeconomic in nature and are, therefore, beyond our control. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, our actual results, performance or achievements may vary materially from those described in this prospectus as anticipated, believed, estimated, expected, intended, planned or projected. We neither intend nor assume any obligation to update these forward-looking statements, which speak only as of their dates.

SPECIAL NOTE REGARDING NON-GAAP FINANCIAL MEASURES

        The body of generally accepted accounting principles is commonly referred to as "GAAP." For this purpose, a non-GAAP financial measure is generally defined by the SEC as one that purports to measure historical or future financial performance, financial position or cash flows but excludes or includes amounts that would not be so adjusted in the most comparable U.S. GAAP measure. From time to time we disclose non-GAAP financial measures, primarily EBITDA, and Adjusted EBITDA, as defined below. The non-GAAP financial measures described in this prospectus should not be viewed in isolation and are not a substitute for GAAP measures of earnings and cash flows.

EBITDA

        EBITDA is defined as earnings (loss) from continuing operations, plus interest expense net of interest income, income taxes and depreciation and amortization.

        Management uses EBITDA as a basis for measuring performance:

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Our management and the board of directors use EBITDA to compare our performance to others in the industry and across different industries and in assessing the value of the business.



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Our management and the board of directors use EBITDA multiples as one criterion in valuing potential acquisitions.



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Management uses EBITDA and EBITDA margin (EBITDA divided by sales), adjusted for earnings of affiliates, special charges, and other (income) expense, on a consolidated basis to assess overall operating performance and to benchmark that performance against others in the industry, on a current basis and over time.



•

Management uses both Operating Profit and EBITDA, adjusted for earnings of affiliates, special charges, stock appreciation rights and other (income) expense, as the primary measures to evaluate ongoing overall, business segment and business line performance.

        Management believes EBITDA is helpful in highlighting trends on an overall basis and in the business segments because EBITDA excludes the results of decisions that are outside the control of operating management and can differ significantly from company to company depending on long-term strategic decisions regarding capital structure, the tax jurisdictions in which the company operates and capital investments. In addition, EBITDA provides more comparability between the historical results of Celanese AG and our results which reflect purchase accounting and the new capital structure.

Adjusted EBITDA

        Adjusted EBITDA, as defined in our indentures and senior credit facilities, differs from EBITDA, as defined above. Adjusted EBITDA is defined as EBITDA further adjusted to exclude unusual items, non-cash items and other adjustments specifically required in calculating covenant compliance

        Management uses Adjusted EBITDA, on a consolidated basis, to evaluate liquidity and financial flexibility, which is particularly important given our leverage. This measure forms the basis for certain financial covenants in our long-term debt that could impact our ability to incur additional indebtedness and make restricted payments. If Adjusted EBITDA were to decline below certain levels, covenants that are based on Adjusted EBITDA, including the interest coverage ratio and fixed charge coverage ratio covenants, could result in, among other things, a default or mandatory prepayment under the senior credit facilities or the inability to pay dividends. See "Management's Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Covenants."

Limitations

        EBITDA and Adjusted EBITDA havehas limitations as an analytical tools,tool, and should not be considered in isolation, or as substitutesa substitute for analysis of our results as reported under GAAP. An investor or potential investor may find any one or all of these items important in evaluating performance, results of operations, financial position and liquidity. Some of these limitations are:

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EBITDA and Adjusted EBITDA dodoes not reflect the significant interest expense or the cash requirements necessary to service interest or principal payments on our debt;



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EBITDA and Adjusted EBITDA dodoes not reflect cash tax payment requirements;



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EBITDA and Adjusted EBITDA dodoes not reflect cash expenditures, future requirements for capital expenditures or contractual commitments;



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Although depreciation and amortization are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future, and EBITDA and Adjusted EBITDA dodoes not reflect any cash requirements for such replacements;



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EBITDA and Adjusted EBITDA dodoes not reflect changes in, or cash requirements for, our working capital needs;



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Adjusted EBITDA excludes non-cash income or expense that may be indicative of future needs for capital expenditures, for development or acquisition of intangible assets or relevant trends causing asset value changes;



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Adjusted EBITDA excludes certain unusual expenses that we consider non-operating or that are permitted adjustments under our covenant tests, such as franchise taxes and the Sponsor monitoring fee. In the future we will incur expenses such as those used in calculating Adjusted EBITDA. Our presentation of Adjusted EBITDA does not mean that our future results will be unaffected by unusual or nonrecurring items; and



•

Other companies in our industry may calculate these measuresEBITDA differently than we do, limiting theirits usefulness as comparative measures.

        Management compensates for the limitations of using non-GAAP financial measures by using them to supplement GAAP results to provide a more complete understanding of the factors and trends affecting the business than GAAP results alone. Management also uses other metrics to evaluate capital structure, tax planning and capital investment decisions. For example, management uses credit ratings

and net debt ratios to evaluate capital structure, effective tax rate by jurisdiction to evaluate tax planning, and payback period and internal rate of return to evaluate capital investments. Management also uses trade working capital to evaluate its investment in receivables and inventory, net of payables.

        EBITDA and Adjusted EBITDA areis also presented because management believes such measures areit is frequently used by securities analysts, investors and other interested parties in the evaluation of issuers. Management believes that EBITDA and Adjusted EBITDA provideprovides useful information for comparing companies in the same industry and across different industries. For example:

•

Interest expense is dependent on the capital structure and credit rating of a company. However, debt levels, credit ratings and, therefore, the impact of interest expense on earnings vary in significance between companies.



•

The tax positions of individual companies can vary because of their differing abilities to take advantage of tax benefits and the differing jurisdictions in which they transact business, with the result that their effective tax rates and tax expense can vary considerably.



•

Companies differ in the age and method of acquisition of productive assets, and thus the relative costs of those assets, as well as in the depreciation method (straight-line, accelerated, units of

production), which can result in considerable variability in depreciation and amortization expense between companies.

        Investors or potential investors should not rely on EBITDA or Adjusted EBITDA as a substitute for any GAAP financial measure. In addition, calculations of EBITDA and Adjusted EBITDA contained in this prospectus may or may not be consistent with that of other companies. We strongly urge investors or potential investors to review the reconciliations of EBITDA and Adjusted EBITDA contained in this prospectus, including the related explanations, the limitations of these exclusions described above, and the other financial information contained in this prospectus. We also strongly urge investors or potential investors not to rely on any single financial measure to evaluate our business.

THE TRANSACTIONS

        As used in this prospectus, the term "Transactions" means, collectively, the Tender Offer, the Original Financing, the Refinancing and the Senior Discount Notes Offering described below. Our current ownership structure is summarized on page 39.

The Tender Offer and the Original Financing

        Pursuant to the Tender Offer, in April 2004 the Purchaser, an indirect wholly owned subsidiary of the Issuer, acquired, at a price of €32.50 per share, a total of 41,588,227 Celanese Shares, representing approximately 84.3%84% of the Celanese Shares outstanding as of June 30, 2004.on that date.

        In addition, as a part of the Tender Offer, the Purchaser agreed to refinance certain existing debt of Celanese, pre-fund certain pension obligations of Celanese, pre-fund certain contingencies and certain obligations of Celanese linked to the value of the Celanese Shares, such as the payment of fair cash compensation under the Domination Agreement for the remaining Celanese Shares, and payment obligations related to outstanding stock appreciation rights, stock options and interest payments, provide additional funds for working capital and other general corporate purposes, and pay related fees and expenses. The sources and uses of funds used in connection with the Tender Offer and the Original Financing are set forth in the table below. See "Description of Indebtedness" for a description of the senior credit facilities.