1. ADITYA BIRLA CHEMICALS LTD.
2. AURO CHEMICAL
3. BJ SERVICES COMPANY
4. HILL BROTHER CHEMICAL COMPANY
5. NEDMAG
6. PETERS CHEMICAL COMPANY
7. QUINGDAO HUADONG CALCIUM PRODUCING CO.LTD
8. SOLVAY SA
9. TANGSHAN SANYOU CHEMICAL INDUSTRIES CO. LTD.
10. TETRA CHEMICALS
11. THE DOW CHEMICAL COMPANY (OCCIDENTAL CHEMICAL CORPORATION)
12. TIGER CALCIUM
13. WEIFANG HAIBIN CHEMICAL CO. LTD
14. WEIFANG TAIZE CHEMICAL INDUSTRY CO. LTD
15. ZIRAX LIMITED