| Aktivsauerstoff |
| Akzo Nobel |
| Aragonesas Industrias y Energia |
| Atofina |
| BASF |
| Bayer |
| Berlinka Perkemija |
| BK Giulini & Co |
| Boehme |
| BP |
| Caffaro |
| CECA |
| Celanese |
| Chemische Fabrik Budenheim |
| Chemische Fabrik Wibarco |
| Chimibase |
| Ciba |
| Clariant |
| Cognis (now part of BASF) |
| Colgate |
| Crompton |
| Dalli-group |
| Degussa (now part of Evonik) |
| Delamine |
| DOMO Caproleuna |
| Dow Corning |
| Dow Europe |
| Eka Chemicals |
| Ercros |
| Ertisa |
| Exxon Mobil Chemicals Europe |
| Firmenich |
| FMC Foret |
| GE Bayer Silicon |
| Genencor |
| Givaudan |
| Henkel |
| Huntsman |
| IFF |
| Industria Chimica Vera |
| Ineos |
| Ingessil |
| IQE - Industrias Quimicas Del Ebro |
| Kao |
| Kemira |
| Lyondell Chemical Nederland |
| Mc Bride |
| Novacap |
| Novozymes |
| OXENO Olefinchemie |
| Perstorp oxo |
| Petresa (Now CEPSA) |
| Polimeri Europa |
| PQ Corporation |
| Prayon-Rupel |
| Procter and Gamble |
| Quest |
| Reckitt Benkiser |
| Rhodia |
| Rio Tinto Borax |
| Rohm & Haas |
| Sasol |
| Shell Chemicals |
| Shin-Etsu Silicon |
| Silmaco |
| Sodes |
| Solutia |
| Solvay |
| Stepan |
| Thermphos International |
| Unilever |
| Uniqema |
| Van Baerle |
| Wacker Chemie |
| Warwick |
| Woellner Silicat |
| Zeoline |
| Zschimmer & Schwarz |
