- Calchem
- Chemical & Mineral Industries Pvt. Ltd.
- FUJIAN SANMU NANO CALCIUM CARBONATE CO. LTD.
- Gulshan Polyols Ltd
- GLC Minerals
LLC
- Huber Engineered Materials
- Imerys
- Lhoist
- MARUO CALCIUM CO. LTD
- Minerals Technologies Inc.
- Mississippi Lime Company
- Newpark Resources Inc.
- OKUTAMA KOGYO CO. LTD
- Omya AG
- Provale Group
- SCHAEFER KALK
- Shiraishi Kogyo Kaisha Ltd