- China Petroleum & Chemical Corporation
- DMSH
- Eni Company
- ENOC Company
- Enterprise Product Partners LP
- Evonik Industries
- Exxon Mobil Corporation
- Formosa Plastics Corporation
- Gazprom Neft PJSC
- Hunan yuxin chemical Co. Ltd
- Huntsman International LLC
- LyondellBasell Industries Holdings BV
- Panjin Heyun Industrial Group Co. Ltd
- Petroleos Mexicanos (PEMEX)
- Petroliam Nasional Berhad (PETRONAS)
- QAFAC
- Reliance Industries Limited
- SABIC
- SIBUR