Chosun Refractories Co. Ltd. Compagnie de Saint-Gobain S.A. HarbisonWalker International Inc. IFGL Refractories Ltd
Imerys S.A. Krosaki Harima Corporation
Minerals Technologies Inc. Morgan Advanced Materials plc
Puyang Refractories Group Co. Ltd. RHI Magnesita N.V. Shinagawa Refractories Co. Ltd.