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- Re:Zinc Sulphate Mono Powder Specifications: -->Purity:98%min Zn:35%min Mn:0.03%max Pb:0.001%max Cd:0.001%max As:0.005%max Water insoluble matter:0.1%max Packing: In 25kgs pp woven bag Re:Zinc Sulphate Hepta Specifications: -->Purity:98%min Zn:22%min Cd:0.001%max Pb:0.001%max Fe:0.002%max Mn:0.1%max Water insoluble matter:0.05%max Packing: In 25kgs pp woven bag