1)Zinc Sulphate Heptahydrate Feed Grade 2)Zn :22.8%,22.51% Min 3)ZnSO4:98%,99%Min 4)Appearance:White crystal powder,granular ... HeptahydrateWe are Tianjin Xinxin Chemical Factory, the largest manufacturer of zinc sulphate heptahydrate in China, and our product export to many countries ... fire, heat and sunshine, sealed package. Stay away from oxide Zinc Sulphate Heptahydrate Feed Grade