1. American Elements
2. BJS Ceramics GmbH
3. CeramTec GmbH
4. COI Ceramics Inc.
5. Grindwell Norton Ltd.
6. Haydale Graphene Industries PLC
7. Insanco Inc.
8. Matech Solutions
9. NGS Advanced Fibers Co. Ltd.
10. Nippon Carbon Co. Ltd.
11. SGL Carbon SE
12. Specialty Materials Inc.
13. Suzhou Saifei Group Co. Ltd.
14. TISICS Ltd.
15. UBE Corporation