Gypsum | Products Services | Sumitomo Metal Mining Co., Ltd.
Gypsum Overview. Gypsum is dihydrate gypsum in white powder form. Dihydrate gypsum is produced by adding two molecules of water of crystallization to the composition of calcium sulfate, which is a byproduct of copper refining. Quality characteristics. SO3 (45 to 488%), CaO (31 to 34%), water of crystallization (18% or higher) Applications