Zinc Sulphate Heptahydrate Zn: 21%, 22% min, Zinc Sulphat Monohydrate Zn: 35%min, Zinc Sulphate Granular 2-4mm, Pb/As/Cd: 10ppm Zinc Sulphate IUPAC ... ZnSO4·7H2O is known as goslarite. Specification ProductZinc sulphate heptahydrateZinc sulphate monohydrateZn21% min35% minAs10ppm Max5 ppmCd10ppm Max10ppmPb15ppm Max10ppmHg5ppm Max ... ppm max, Size: 2-4mm, 1-3mm pharmaceutical grade Zinc Sulphate