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Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO4 and related hydrates. In the form of γ-anhydrite (the anhydrous form), it is used as a desiccant
C 1518 (OTTO) Calcium sulphate, anhydrous - used as a lubricant to provide good gloss, preventing dusting and fold cracking in paper and paperboard making.