1)Zinc Sulfate Heptahydrate Food Grade 2)Zn :22.8%,22.51% Min ... %Min 4)Appearance:White crystal powder,granular Food Grade Zinc Sulfate Heptahydrate 1) Physical and chemical property:Molecular formula ZnSO4 7H2OMolecular ... , heat and sunshine, sealed package. Stay away from oxide Zinc Sulfate Heptahydrate Food Grade