Sodium Sulphate Anhydrous CAS NO: 7757-82-6 Molecular formula：Na2SO4 Molecular weight：142.03 Properties: white fine crystal or powder, easily soluble in water; absorb moisture; odorless, non-toxic. Specifications: Purity [Na2SO4 dry] % 99.5Min Water insoluble matter% 0.01Max Arsenic [As] % 0.0002Max Heavy metals (as Pb) % 0.0005Max Iron [Fe] % 0.0005Max Chloride [CL] % 0.001Max Calcium [Ca] % 0.002Max Phosphate [PO4] % 0.002Max Nitrogen quantity [N] % 0.002Max Calcination loss% 0.3Max Usage: widely used in vinylon, sodium silicate, bleaching, glass, paper making, tanning, metal smelting, surface treatment and filler industries. Packing: 25/50kgs, p.p. Woven bag.