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General Specification: Purity: ≥96% Combine water: 18.5 – 19.5% SiO2: 0.85 – 1.3 % SO3: 41 – 43 % CaO: 30 - 32 % MgO: 0.5- 0.6% Fe2O3: 0.03 -0.08% Chloride: 0.005 – 0.009% Moisture: 0.6 – 0.8% Al2O3: 0.04- 0.06% Also available with ≥96% purity for making gypsum plaster (powder)