1)Zinc Sulfate Heptahydrate Food Grade 2)Zn :22.8%,22.51% Min 3)ZnSO4:98 ... %,99%Min 4)Appearance:White crystal powder,granular Food Grade Zinc Sulfate Heptahydrate 1) Physical and chemical property:Molecular formula ... .High purity, easy soluble, quick absorbable for human body.2.Low content of heavy metal, Pb, Cd, Hg, Cr and ... sealed package. Stay away from oxide Zinc Sulfate Heptahydrate Food Grade