Appearance: loose powdery material, light gray to beige in color Calcium sulfate content (CaSO₄·2H₂O), %: 85–95 Moisture content, %, max: 10 pH (10% solution): 5.0–6.5 Impurities: may contain trace amounts of phosphorus, fluorine, and organic residues PARTICLE SIZE DISTRIBUTION Mass fraction of particles smaller than 0.5 mm, %, not less than: 90 Friability, %: 100