Disodium Phosphate(DSP) specifications: specifications/p> Indexes (grade I) Content of Na2HPO4.12H2O ≥97.0% Content of sulphate(calculated with SO42-), ≤0.7% Content of chloride(calculated with Cl), ≤0.05 % Content of the water-indissoluble ≤0.05% Content of Fluoride(calculated with F), ≤ 0.05% Content of As, ≤0.005% pH value ≤ 9.0±0.2%