- Bengal Chemicals & Pharmaceuticals Ltd.
- CarbonTech Group
- Compro Shijiazhuang Fine Chemical Co. Ltd
- DEZA a.s
- Epsilon Carbon
- Exxon Mobil Corporation
- Gautam Zen International
- Industrial Quimica del Nalon SA
- JFE Chemical Corporation
- Koppers Inc.
- Merck KGaA
- PCC Rokita SA
- Rain Carbon Inc.
- Tulstar Products Inc.
- Wuxi Kingchan Bio-medical and Chemical Inc.