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Molecular formula ZnSO4 7H2O Molecular weight **7.*6 Apprearance: White or slight-yellow crystal Superior Grade Zn *2.*1 % ZnSO4 H2O *9% pH(*0g/L solution) 3.0 Pb 0.**1%max CD 0.**1% max Fe 0.**3% max Mn 0.**5% max Water insoluble 0.*2% First Grade Zn *2.8 % ZnSO4 H2O *8% pH(*0g/L solution) 3.0 Pb 0.**2%max CD 0.**2% max Fe 0.**5% max Mn 0.*1% max Water insoluble 0.*2% Usage: As raw material for making zinc salts, Zinc stearate, Zinc carbonate, Zinc Borate, Triscabol and lithopone and so on. It is used as a main subsidiary material for electroplate pure zinc, electroplate Industry, washing of wood, leather preservation, bone glue fine and preservation and dye stuff in printing and dyeing. Best Quality, Fast Delivery, Competitive Price, Your reliable supplier