Formula: CaSO₄·2H₂O CAS: 10101-41-4 EC No.: 231-900-3 M (Molar Mass): 172.17 g/mol D (Density): 2.32 g/cm³ mp (Melting Point): 128°C (loses water) bp (Boiling Point): 163°C (decomposes)

Assay (Titration): ≥ 98.0 % Appearance: White powder. Identification (IR): Passes test. Chloride (Cl): ≤ 0.05 % Heavy Metals (as Pb): ≤ 20 ppm Iron (Fe): ≤ 0.02 % Carbonate (CO₃): ≤ 0.5 % Loss on Ignition: 19.0-21.0 % Acid insoluble matter: ≤ 0.2 % pH (5% slurry): 5.5-7.5