zinc sulphate monohydrate pharmaceutical grade 1,colorless white crystal 2,relative density: 1.957, 3. ... Vitriol, W zinc sulphate monohydrate pharmaceutical grade Spec as follows:Fertilizer grade(HG/T2326-92)Feed grade(HG/2934-2000)Assay(ZnSO4.7H2O ... 250um sieve)≥95%The Uses of zinc sulphate monohydrate pharmaceutical grade 1, Zinc Sulphate is mainly used as the raw material ...