Product name:Zinc sulfate heptahydrate ItemPremium gradeFirst gradeRegular gradeZn% min22.5122.0620.92ZnSO4.7H2O% min99.0 97.0 92.0 Insoluble matter% max0.020 0.050.10 PH Value(50g/L)3.0 3.0 Cl% max0.20 0.60 Fe% max0.0050.020 0.060 Pb% max0.0020.010 0.010 Mn% max0.010.10 Cd% max0.0020.10 Cu% max0.002PackagePacked in net 25KG woven bags with plastic bag inside.H.S.code28332930