Acme-Hardesty Co.

General Chemical

PPG Industries

Airgas

Imerys

PQ Corporation

Allied Signal

Innophos

Puritan Products

American Colloid

International Metals

Reheis

Americhem

International Specialty Products

Rhodia

Andersons

Jones Hamilton

Roquette Corp.

Ashta Chemical

Jungbunzlauer

Rot Quimica

Atotech

Kemiron

Solvay Chemicals

BP Chemicals

MacDermid Inc.

SQM North America

Cargill

Mosaic

Sun Co.

Celite

Nitrochem Inc.

U.F. Strainrite

Church & Dwight

North American Salt

U.S. Borax

Degussa

Occidental Chemical

U.S. Gypsum

Dow Chemical

Oil Associates

Unocal

Engelhard Materials

Olin Chemicals

Velsicol

FMC Corp.

Pioneer

World Minerals