EX-1 3 file002.txt JOINT FILING AGREEMENT Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(f) of the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing on behalf of each of us of an amendment to Schedule 13D relating to the Ordinary Shares of Celanese AG, a German stock corporation, and that any subsequent amendments thereto filed by any of us will be filed on behalf of each of us. This Agreement may be included as an exhibit to such joint filing. DATE: December 24, 2003 BCP CRYSTAL ACQUISITION GMBH & CO. KG By: /s/ Chinh Chu -------------------------------- Name: Chinh Chu Title: Authorized Person BCP ACQUISITION GMBH & CO. KG By: /s/ Chinh Chu -------------------------------- Name: Chinh Chu Title: Authorized Person BCP HOLDINGS GMBH By: /s/ Chinh Chu -------------------------------- Name: Chinh Chu Title: Authorized Person BCP MANAGEMENT GMBH By: /s/ Chinh Chu -------------------------------- Name: Chinh Chu Title: Authorized Person BCP LUXEMBOURG HOLDINGS S.AR.L. By: /s/ Chinh Chu -------------------------------- Name: Chinh Chu Title: Authorized Person BLACKSTONE CAPITAL PARTNERS (CAYMAN) IV L.P. By: Blackstone Management Associates (Cayman) IV L.P., its general partner By: Blackstone LR Associates (Cayman) IV Ltd., its general partner By: /s/ Chinh Chu ------------------------ Name: Chinh Chu Title: Authorized Person BLACKSTONE CAPITAL PARTNERS (CAYMAN) IV-A L.P. By: Blackstone Management Associates (Cayman) IV L.P., its general partner By: Blackstone LR Associates (Cayman) IV Ltd., its general partner By: /s/ Chinh Chu -------------------------- Name: Chinh Chu Title: Authorized Person BLACKSTONE FAMILY INVESTMENT PARTNERSHIP (CAYMAN) IV-A L.P. By: Blackstone Management Associates (Cayman) IV L.P., its general partner By: Blackstone LR Associates (Cayman) IV Ltd., its general partner By: /s/ Chinh Chu -------------------------- Name: Chinh Chu Title: Authorized Person BLACKSTONE MANAGEMENT ASSOCIATES (CAYMAN) IV L.P. By: Blackstone LR Associates (Cayman) IV Ltd., its general partner By: /s/ Chinh Chu -------------------------------------- Name: Chinh Chu Title: Authorized Person BLACKSTONE LR ASSOCIATES (CAYMAN) IV LTD. By: /s/ Chinh Chu ------------------------------------------- Name: Chinh Chu Title: Authorized Person /s/ Peter G. Peterson ------------------------------------------- PETER G. PETERSON /s/ Stephen A. Schwarzman ------------------------------------------- STEPHEN A. SCHWARZMAN