Quality standard

Item Standard
Industry grade    
Identification in accordance with standard    
Assay ,%  98.0min
Loss on dry %  0.50max
Reduzate %  0.70max
PH 6.2 -7.8
Sulfate %  0.05 max
Chloride %  0.07max
Pb u g/g  2max  
Arsenic salt  u g/g  2 max
Heavy metals u g/g  10 max