CSG Calcium Sulfate (calcium sulphate,gypsum) in food Dihydrate is chosen to supply calcium in food industry, tofu coagulant. Containing 23% calcium, the high purity above 99%, neutral pH filler, is a food and pharmaceutical grade form of calcium sulfate (calcium sulphate) powder produced by grinding highly refined natural gypsum that contains about 20% crystal water. The molecular formula is CaSO4·2H2O. CSG Food Grade Calcium Sulfate(calcium sulphate, gysum) Dihydrate meets the standards of the FCC(Food Chemicals Codex) and E516,USP.