- AGC Inc.
- CoorsTek Inc.
- Corning Incorporated
- Dongguan Hongtai Glass Co. Ltd.
- Jingniu Glass Ceramics Group Co.Ltd.
- Kanger Glass-ceramic Co. Ltd.
- KEDI Glass-ceramic Industrial Co. Ltd.
- Morgan Advanced Materials plc
- Nippon Electric Glass Co.Ltd.
- Ohara Corporation
- Saint-Gobain
- SCHOTT AG