Alteo
AluChem, Inc.
AC Tech
American Ceramic Society (ACerS)
Calucem
CIMSA Cimento Sanayi ve Ticaret A.S.
FX Minerals, Inc.
Elkem Materials, Inc
Gorka Corp
Great Lakes Minerals
Harrop Industries, Inc
Hindalco Industries Limited
Imerys Refractory Minerals
Kyanite Mining Corporation
Kymera International
Refractory Minerals Co., Inc.
Ribbon Technology Corporation
Traxys
U.S. Electrofused Minerals, Inc.
Washington Mills Electro Minerals Corp.
