Food grade standard
Content (as na2s2o5) % 97.0
Phase white or light yellow crystalline powder
Appearance of solution- colorless and transparent
Iron (as fe 0.003
Arsenic (as as)% 0.0001
Heavy metalas pb 0.0005
Ph value 0-4.6
Water insoluble % 0.05
Industrical grade standard
Content (as na2s2o5)% 96.5
Phase white or light yellow crystalline powder
Appearance of solution-
Iron (as fe) 0.005
Arsenic (as as)% 0.0001
Heavy metal, as pb, % 0.0005
Ph value 4.0-4.6
Water insoluble % 0.05
High purity grade standard
Content (as na2s2o5) 98.0
Phase white or light yellow crystalline powder
Appearance of solution-
Iron (as fe) 0.003
Arsenic (as as) 0.0001
Heavy metalas pb 0.0005
Ph value 4.0-4.6
Water insoluble 0.05
