Albemarle Corporation
Alteo Holding
Aluminum Corporation of China Ltd. (Chinalco)
Hayashi Kasei Co. Ltd.
Huber Engineered Materials
Lkab Minerals AB
MAL - Magyar Alumnium Termel s Kereskedelmi Zrt.
Nabaltec AG
SCR-Sibelco N.V.
Southern Ionics Inc.
Spectrum Chemical Manufacturing Corporation
Sumitomo Chemical Co. Ltd.
The R.J. Marshall Company