BASF Corporation

BP Amoco Chemical

BP Amoco Refinery

Chevron Chemical

Chevron/Phillips Chemical

Ciba-Geigy

Cit-Con Oil Corporation

Citgo Petroleum

Citgo Refinery

Coastal Refining

Conoco-Phillips Company

Dolphin Energy

Dow Chemical

Dupont

Exxon Mobil

Houston Refining Lp

Huntsman Corporation

Hydrochem, Inc.

Hydro Machinery

Invista

James River Corporation

Lyondell Petrochemical

Marathon LLC

Merichem Chemicals & Refinery

Metal Works Corp.

Motiva Enterprises LLC

Rohm & Haas Company

Shell Chemical Company

Shell Offshore, Inc.

Sierra Pacific

Solvey Polymers

S.S.&S. Fabricators

Stp Nuclear Operating Company

Technip USA Corporation

Temple Innland

Total Petrochemicals

GE

VALERO

Mitsubishi

Anadarko Petroleum

SASOL

Nature Works

Westlake Petrochemical

Weatherford

ConocoPhillips

Transocean Ltd.

Ameri-Forge

Lucite

Ecopetrol