1. 3M Company
2. Cangzhou Sefu Ceramic New Materials Co. Ltd.
3. CDTi Advanced Materials Inc.
4. CeramTec GmbH
5. Compagnie de Saint Gobain SA
6. CoorsTek Inc.
7. Corning Incorporated
8. Ibiden Co. Ltd.
9. Imerys S.A.
10. Johnson Matthey PLC
11. Kyocera Corporation
12. LiqTech Holding A/S
13. Logical Clean Air Solutions
14. Schott AG
15. Tenneco Inc.
16. Umicore N.V.