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Westlake Chemical Corporation Headquarters

2801 Post Oak Blvd.
Houston, TX 77056
Phone: (713) 960-9111

David Hansen - Media Relations mediarelations@westlake.com
Steve Bender - Investor Relations investorrelations@westlake.com

Westech Building Products

P.O. Box 567
Mt. Vernon, IN 47620
Phone: (812) 985-3628
Toll-free in North America: (888) 953-3623

North American Pipe Corporation

2801 Post Oak Blvd., Suite 600
Houston, TX 77056
Phone: (713) 840-7473
Toll Free: (800) 999-7473
Fax: (713) 552-0087

North American Specialty Products LLC

993 Old Eagle School Rd, Suite 416
Wayne, PA 19087
Phone: (484) 253-4545
Fax: (713) 343-8432

Westlake Chemical (China) Corporation Shanghai Rep. Office

Room 2608-09, No. 555 Loushanguan Road
200051 Shanghai
Phone: +86 21 62290528
Fax: +86 21 62291527