1. Alumina d.o.o. Zvornik
2. Ankit Silicate
3. BASF SE
4. C THAI Group
5. CIECH S.A.
6. Coogee Chemicals Pty Ltd.
7. Evonik Industries AG
8. Hindcon Chemicals Ltd.
9. IQE Group
10. Kiran Global Chems Limited
11. Malpro Silica Private Limited
12. Merck KGaA
13. Nippon Chemical Industrial Co. Ltd.
14. Occidental Petroleum Corporation
15. Oriental Silicas Corporation
16. PQ Group Holdings Inc.
17. Quimialmel
S.A.
18. Sahajanand Industries
19. Shaoxing Huachang New Material Co. Ltd.
20. Shayona Group
21. Silmaco NV
22. Sinchem Silica Gel Co. Ltd.
23. Tokuyama Corporation
24. Welcome Chemicals
25. Zak?ady Chemiczne "Rudniki" S.A.