Vesuvius
Harbisonwalker International
Saint-Gobain
Shinagawa Refractories
Chosun Refractories Co. Ltd
Coorstek Incorporated
RHI Magnesita
Morgan Advanced Materials
Corning Incorporated
Krosaki Harima
Imerys
Harbisonwalker International
IFGL Refractories Ltd
Minerals Technologies Inc.
Magnezit Group