- Volclay International Corporation—Hoffman
Estates, Illinois
- Volclay Pty. Ltd.—Geelong, Victoria, Australia
- Ashapura Volclay Ltd.—Mumbai, India
- Ashapura Minchem Ltd.—Mumbai, India
- Volclay Dongming Industrial Minerals Co., Ltd.—Beijing, China; Jianping, China
- Volclay de Mexico—Gomez Palacio, DGO, Mexico
- Volclay Siam—Rayong, Thailand
- Egypt Mining and Drilling Chemicals Co.—Alexandria, Egypt
- Nissho Iwai Bentonite Co.—Tokyo/Nagoya, Japan
- Volclay Korea Ltd.—Seoul, Korea
- ACC—Hoffman
Estates, Illinois; Belvidere, Illinois; Archbold, Ohio; Letohatchee, Alabama; Sandy Ridge, Alabama; Granite City, Illinois; Troy, Indiana;
Pickett, Wisconsin; Waterloo, Iowa; Albion, Michigan; Gascoyne, North Dakota; Columbus, Ohio; York, Pennsylvania; Belle Fourche, South Dakota; Chattanooga, Tennessee; Neenah; Wisconsin; Colony, Wyoming (two plants); Lovell, Wyoming;
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