Sakai Chemical Industry Co., Ltd.
Nippon Chemical Industrial Co., Ltd.
Fuji Titanium Industry Co., Ltd.
KCM Corporation
Toho Titanium Co., Ltd.
JFE Mineral and Alloy Company, Ltd.
Sumitomo Metal Mining Co., Ltd.
SHOEI CHEMICAL INC.
TANAKA Precious Metal Technologies Co., Ltd.
DOWA Electronics Materials Co., Ltd.
Prosperity Dielectrics Co., Ltd.
Daejoo Electronic Materials Co., Ltd.