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                zinc sulfate

                Chemical name: Zinc Sulfate
                Molecular formula: ZnSO4.H2O,ZnSO4.7H2O
                Molecular weight: 179.48(Monohydrate), 287.54(Heptahydrate)
                CAS NO: 7446-19-7(H2O); 7446-20-0 (7H2O)
                Character: It is colorless or white crystalline powder, odorlessness. Efflorescence in air. Acid hydrometer is 1.957(25/4℃) to litmus. Melting point is 100℃. It's soluble in water and glycerol, insoluble in ethanol and light toxicity, lose crystal water in 280℃.
                Usage: It is used as food additives, animal feed, printing and dyeing, timber preservative.Used as analytical reagent.
                Packaging: It is packed with polythene bag as the inner layer, and a compound plastic woven bag as the outer layer. The net weight of each bag is 25kg.
                Storage and Transport: It should be stored in a dry and ventilative warehouse; kept away form water and moisture during transport; unloaded with care, so as to avoid damage to bags. Furthermore, it should be stored separately from poisonous substances.
                Specification GB25579-2010 FCC,1996
                Content w/% ZnSO4.H2O 99.0-100.5 98.0-100.5
                ZnSO4.7H2O 99.0-108.7 99.0-108.7
                As,mg/kg?≤ 0.0003 -
                Alkali metal w/%?≤ 0.50 0.5
                PH passed qualified
                Se,mg/kg?≤ 0.003 0.003
                Hg,mg/kg?≤ 0.0001 0.0005
                Pb,mg/kg?≤ 0.0004 0.001
                Cd,mg/kg?≤ 0.0002 0.0005


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