(99.5% Pure & Pharma Grade) Color & Physical Form White / Colorless Crystal Active Ingredient K2SO4 Assay Min 99 % Molecular Wt. 174.25 Chloride NMT 0.002% Iron NMT 0.002 % Nitrogen NMT 0.005 % Heavy Metals (as Pb) NMT 0.002% Moisture By mass NMT 0.2 %