Zinc Sulfate Hepta hydrates : Zn 22 %

Sr.No. Test Requirements
1 Description Material shall be white dry free flowing powder or crystal consisting essentially of ZnSO4. 7H2O.
2 Zinc as Zn (% w/w) 22.0 Min
3 Magnesium as Mn and Ca(% w/w) 0.10 Max
4 Copper as Cu (% w/w) 0.10 Max
5 Heavy metals as Pb (ppm) 0.003 Max
6 pH (10% aqueous solution) 4.0 to 5.50
7 Matter insoluble in water (% w/w) 0.10 Max
8 Iron as Fe (ppm) 20 Max
9 Clarity (40%w/v in water, %w/w) It should be transparent clear
10 Chloride (% w/w) 1.0 Max
11 Organic content (ppm) 500 Max