Westlake Chemical to Announce 1st Quarter 2004 Earnings

Houston, Texas – May 04, 2004 – /PRNewswire/ - Westlake Chemical Corporation will release its 2004 first quarter earnings early the morning of Tuesday, May 11, 2004.

The company will host a conference call at 11:00 a.m. Eastern Time (10 a.m. Central Time) on the same day to discuss the earnings release.

To access the conference call, dial (800) 299-7635, or (617) 786-2901 for international callers, approximately 10 minutes prior to the scheduled start time and reference passcode 41058571. The earning release will also be available via the company's web page at http://www.westlakegroup.com/news.html.

Westlake is a manufacturer and supplier of petrochemicals, polymers and fabricated products with headquarters in Houston, Texas. The company's range of products includes ethylene, polyethylene, styrene, vinyl intermediates, PVC and PVC pipe, windows and fence. For more information, visit the company's Web site at http://www.westlakegroup.com/.