1)Zinc Sulfate Heptahydrate Agriculture Grade 2)Zn :22.8%,22.51% Min 3)ZnSO4 ... :98%,99%Min 4)Form:White crystal powder,granule Zinc ... are Tianjin Xinxin Chemical Factory, the largest manufacturer of zinc sulfate heptahydrate in China,and our product export to ... fire, heat and sunshine, sealed package. Stay away from oxide Zinc Sulfate Heptahydrate Agriculture Grade