References
| Adolf Löbl | Germany |
| AGR mbH | Germany |
| American Iron & Metal Company Inc. | Canada |
| APK AG | Germany |
| Asia Cement Public Co. Ltd. | Thailand |
| Aurubis AG | Germany |
| Badische Stahlwerke GmbH | Germany |
| BP Europe SE | Germany |
| Breedon Cement Ireland Ltd | Great Britain |
| Cargill Deutschland GmbH | Germany |
| CBMI Construction Co., Ltd. | China |
| Cement Australia | Australia |
| Cementownia Warta S.A. | Poland |
| DEUMU Deutsche Erz- und Metall-Union GmbH | Germany |
| DL E&C Co., Ltd. | South Korea |
| Dyckerhoff GmbH | Germany |
| EJOT SE & Co. KG | Germany |
| Ferrexpo Poltava Mining | Ukraine |
| F.L. Smidth A/S | Denmark |
| GKH - Gemeinschaftskraftwerk Hannover GmbH | Germany |
| Glencore Nikkelverk A/S | Norway |
| GMH Recycling GmbH | Germany |
| HUGA KG | Germany |
| Hüttenwerke Krupp Mannesmann GmbH | Germany |
| IVA Schmetz GmbH | Germany |
| JHT Jakobs-Houben Technologie GmbH | Germany |
| Kronos Titan GmbH | Germany |
| Lafarge Africa Plc | Nigeria |
| Loesche GmbH | Germany |
| MEWA Textil-Service AG & Co | Germany |
| Miele & Cie. KG | Germany |
| Mitsubishi Heavy Industries Ltd. | Japan |
| Multiport GmbH | Germany |
| nobilia-Werke J. Stickling GmbH & Co. KG | Germany |
| PARADOR GmbH | Germany |
| Paul Hartmann AG | Germany |
| Paul & Co. GmbH & Co. KG | Germany |
| Gebr. Pfeiffer SE | Germany |
| proFagus GmbH | Germany |
| RSH Polymere GmbH | Germany |
| Schmidt Verpackungstechnik GmbH & Co. KG | Germany |
| Schwenk Zement GmbH & Co. KG | Germany |
| SMS group GmbH | Germany |
| Socrematic | France |
| Speira GmbH | Germany |
| Stena Recycling AS | Norway |
| Tata Steel Ijmuiden B.V. | Netherlands |
| Theo Steil GmbH | Germany |
| ThyssenKrupp Steel Europe AG | Germany |
| UNACEM Peru S. A. | Peru |
| VDM Metals GmbH | Germany |
| J. M. Voith SE & Co. KG / VPH | Germany |
| Windmöller & Hölscher KG | Germany |
| Yanbu Cement Company | Saudi Arabia |
