Investor Contacts

Mark Oberle Tel. +1-972-443-4464 Fax +1-972-443-8519 investor.relations@celanese.com

Transfer Agent/Stockholder Services

General inquiries about individual stock accounts may be directed to Celanese's stock transfer agent: Computershare Trust Company, N.A. P. O. Box 43010 Providence, RI 02940-3010 Tel. +1-781-575-2400 http://www.computershare.com/equiserve