- BASF SE
- Borealis AG
- Cornerstone Chemical Company
- East China Engineering Science & Technology Co. Ltd (ECEC)
- Grupa Azoty Zaklady Azotowe Pulawy SA
- Gujarat State Fertilizers & Chemicals Ltd
- INEOS Group
- Methanol Holdings (Trinidad) Limited (MHTL)
- Mitsui Chemicals Inc.
- Momentive Specialty Chemicals Inc.
- Nissan Chemical Industries Ltd
- OCI Melamine
- Qatar Melamine Co.
- Shanxi Fenghe Melamine Co.
- Sichuan Chemical Holdings Co. Ltd