ALMATIS GMBH
AMCOL INTERNATIONAL
APYRON TECHNOLOGIES Inc.
ARKEMA Inc.
AXENS NORTH AMERICA Inc.
BASF AG
CALGON CARBON CORP.
CARBOCHEM CORP.
CARBON ACTIVATED CORP.
CPL CARBON LINK CORP.
CRITERION CATALYST CO.
EXXONMOBIL OIL CORP.
FILTERCOR Inc.
FILTERSPUN Inc.
GENERAL CARBON CORP.
GSA RESOURCES Inc.
INGEVITY
J.M. HUBER CORP.
MARTIN MARIETTA MAGNESIA SPECIALTIES Inc.
MULTISORB TECHNOLOGIES Inc.
NANOPORE Inc.
NUCON INTERNATIONAL Inc.
POROCEL CORP.
PQ CORP.
RESINTECH Inc.
SHELL OIL CO.
STEELHEAD SPECIALTY MINERALS
SUD-CHEMIE ADSORBENTS
TEAGUE MINERAL PRODUCTS
TIGG CORP.
UOP
W.R. GRACE & CO.
WESTATES CARBON Inc.
ZEOCHEM
ZEOLYST INTERNATIONAL