Investor Contacts

Jon Puckett Tel. 972-443-4965 Fax 972-443-8519 Investor.relations@celanese.com

Transfer Agent/Stockholder Services

General inquiries about individual stock accounts may be directed to Celanese's stock transfer agent: Computershare Investor Services P. O. Box 43078 Providence, RI 02940-3078 Tel. +1-781-575-3400 http://www.computershare.com/equiserve