- AGC (Rayong & Bkk)
- DOW Chemical
- National Strach & Chemical
- Peroxy Thai
- Pure Chem
- Siam PVS
- Sak Chaisit
- Solutia Chemicals
- Surin Omya
- Viny Thai
- Thai Carbon Product
- Thai Carbon Black
- Thai Chemical
- Thai Organic
- Ueno Fine Chem
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