1)Zinc Sulfate Heptahydrate Agriculture Grade 2)Zn :22.8%,22.51% Min 3)ZnSO4:98%, ... %Min 4)Form:White crystal powder,granule Zinc Sulfate Heptahydrate Agriculture GradeWe are Tianjin Xinxin Chemical Factory, the largest manufacturer of ... sunshine, sealed package. Stay away from oxide Zinc Sulfate Heptahydrate Agriculture Grade