Product Name:Zinc Sulphate Heptahydrate Molecular Formula:ZnSO4·7H2O Contents(%): Item UnitZinc Sulphate Heptahydrate(feed grade)Zinc Sulphate Heptahydrate(industry grade)Zn%min21.521.5Pb(ppm)max1020Cd(ppm)max 10 30As(ppm)max55Fe(ppm)max70 -purity%9898Grade:industial grade Usage;mainly used in beneficiation, trace element fertilizer, feed, drug, plating, chemical fiber, antiseptic of paper and wood, leather-making and coating, etc