- 3M (Ceradyne Inc.)
- Cabot Corporation
- Clariant
- Denka Company Limited
- Evonik Industries
- Fuji Silysia Chemical
- Fuso Chemical Co. Ltd
- Glassven C.A
- Imerys?
- Merck KGaA
- Orisil
- W. R. Grace & Co.
- Wacker Chemie AG