?- Omya AG
- HOFFMANN MINERAL
- Covia Holdings Corporation
- LKAB Minerals
- K?rntner Montanindustrie.
- Amco Polymers.
- Orkila
- Huber Engineered Materials (HEM)
- Quarzwerke GmbH
- 20 Microns Limited
- GCR Group
- Minerals Technologies Inc.
- Imerys