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Calcium Sulphate (dihydrate) - 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 1517 (OTTO) Calcium sulphate, dihydrate, GR 99%+ Cas 10101-41-4 - used in aluminothermy.