Orion Engineered Carbons S.A, Cabot Corporation, Birla Carbon, Denka Company Limited, Phillips Carbon Black Limited, Mitsubishi Chemical Corporation, Tokai Carbon Co. Ltd, China Synthetic Rubber Corporation, Imerys SA, Shandong Huibaichuan New Materials, Shanxi Fulihua Chemical Materials, Beilum Carbon Chemical Limited, Shandong Emperor-Taishan Carbon, Zaozhuang Xinyuan Chemical Industry, Sid Richardson Carbon&Energy