• Evonik Industries AG (RAG-Stiftung)
• TAEKWANG Industrial Co. ltd.
• Arkema S.A.
• Grupa Azoty S.A.
• Solvay SA
• Akzo Nobel N.V.
• Gujarat Alkalies and Chemicals Limited
• Mitsubishi Gas Chemical Company Inc.
• OCI Company Ltd.
• Airedale Chemical Holdings Limited