Appearance:colorless to white crystal or white crystal powder
Assay:99.5%,
Melting range (℃):184.0~187.0
Water solutioin appearance:colorless transparent or basically colorless transparent
Chloride:0.007% max,
Sulphate (SO42-):0.02%max,
Heavy metal (Pb2+):0.001% max,
Ferrum content:0.002% max,
Potassium permanganate reducing substances:Qualified
Arsenic content (As):2ppm max,