Zinc Sulphate Monohydrate zinc sulpahte HengyangKaiWang ChemicalCO.LIT. is a biggest cgemical factory in China. You can mail me if you interested in our cargos.high quality with super lowest price. The details as follows: Zinc(Zn):35%min Pb:0.001%max Cd:0.001%max As:0.0005%max Fe:0.006%max Water insoluble:0.03%max PH:4min You can contract with us if you need buy.