1. AdTech Metallurgical Materials
2. Famatel UK Ltd
3. ICT International
4. Jiangsu Jinghui Refractories and Jingxin High-temperature Material
5. KeraNor AS
6. KYOCERA Corporation
7. Morgan Advanced Materials PLC
8. NGK Spark Plug Co. Ltd.
9. Nippon Tungsten Co. Ltd.
10. Nishimura Advanced Ceramics Co. Ltd.
11. Porvair PLC
12. Refractron Technologies Corporation
13. STC Superior Technical Ceramics
14. Toto Ltd.
15. Xiamen Innovacera Advanced Materials Co. Ltd