3M Company

Aera Energy LLC

Aramco Services Company

Archer Daniels Midland Company

Arkema Inc.

Ascend Performance Materials

Axiall Corporation

B P

Celanese Ltd.

Chevron Corporation

CITGO Corporation

ConocoPhillips

Covidien

Dow Corning Corporation

E.I. DuPont de Nemours & Co., Inc.

Eastman Chemical Company

Evonik Corporation

Flint Hills Resources, LP

FMC Corporation

Grupo Petrotemex - GPT

Hess Corporation

HollyFrontier

Honeywell

Huntsman Corporation

Lubrizol Corp.

Momentive Specialty Chemicals, Inc.

Monsanto Company

Mosaic Fertilizer LLC

Occidental Oil & Gas Corporation

Pasadena Refining System, Inc.

PESRM (Philadelphia Energy Solutions R&M)

Phillips 66 Company

REC Silicon

Rentech, Inc.

Saudi Basic Industries Corporation - SABIC

Sekisui Specialty Chemicals America LLC

Tesoro Corporation

UOP LLC

Western Refining

Zeon Chemicals L.P.

Ambitech Engineering Corporation

BE&K (a KBR company)

Bechtel Corporation

Brinderson LP

Burns & McDonnell

Burrow Global LLC

CB&I

CDI Engineering Solutions

CH2M HILL

Chemtex International

ENGlobal Engineering, Inc.

Fluor

GE Energy

IHI E&C International Corporation

Jacobs Engineering

KBR

Merrick & Company

Middough Inc.

OnQuest

Preferred Engineering

Ref-Chem

S & B Engineers and Constructors, Ltd.

SAIC Energy, Environment & Infrastructure, LLC (SEE&I)

Samsung Engineering America Inc

SK E&C USA Inc

SNC-Lavalin Engineers & Constructors, Inc.

TECHNIP USA

URS Corporation

WorleyParsons Ltd.