1. 3M Company
2. AGC Ceramics Co. Ltd.
3. Bluematchbox Potters Supplies Ltd
4. CCGNZ Group Limited
5. Gujarat Mineral Development Corporation Ltd.
6. Imerys S.A.
7. JL Daga Mines and Minerals Pvt. Ltd.
8. Kajaria Ceramics Limited
9. Kyocera Corporation
10. Laguna Clay Company
11. Mohawk Industries Inc.
12. Morgan Advanced Materials PLC
13. Saint-Gobain Group
14. Stephan Schmidt KG
15. Unifrax I LLC