- BASF SE
- ACH Foam Technologies
- Eastchem A.S.
- Flint Hills Resources
- Formosa Plastics Corporation
- Zhenjiang Chimei Chemical Co. Ltd
- Jiangsu Nijiaxiang Chemical Co. Ltd
- Jiangyin Sunping New Material Co. Ltd
- LANXESS
- Loyal Group
- Ming Dih Group Corporation
- Nova Chemicals Corporation
- Owens Corning
- Plasti-Fab
- Polimeri Europa
- Polioles S.A. de C.V.
- SABIC
- StyroChem
- INEOS Styrolution Group GmbH
- Sunde Group
- SUNPOR
- Supreme Petrochem Ltd
- Synthos S.A.
- Taita Chemical
- Thai ABS Co. Ltd
- Tianjin Jiatai Weiye Chemical Co. Ltd