Content (counting C11H8O2 NaHSO3 3H2O), % >96.0 Sodium Bisulfite (NaHO3) content, % 32.0-34.0 Sulphonic acid menadione No deposition Moisture,% 16.0-18.0 Heavy metal (counting Pb), % <0.002 Arsenic salt (As), % <0.0005 Menadione, % >50 Aspects and characters: White crystal powder, no smell, water soluble, not dissolved in ethanol, hardly dissolved in aether and benzene, stable in normal temperature, easily decomposed under light, stimulating skin and respiratory tract. Annual production capacity: 1000MT/year