?- Chemical & Mineral Industries Pvt. Ltd
- FUJIAN SANMU NANO CALCIUM CARBONATE CO. LTD
- GLC Minerals
- Gulshan Polyols Ltd
- Huber Engineered Materials
- Imerys
- Kemipex
- Lhoist
- Maruo Calcium Co. Ltd
- Minerals Technologies Inc.
- Mississippi Lime Company
- Newpark Resources Inc.
- OKUTAMA KOGYO CO. LTD
- Omya AG
- Provale Holding SA
- SCHAEFER KALK GmbH & Co. KG.
- Shiraishi Kogyo Kaisha Ltd
- Sibelco