... 4)Cu>25%, Pb<10ppm, As<5ppm Copper Sulfate 98% Chemical name: copper sulfate pentahydrate(Other names: Blue vitriol, Blue ... 1999 Specification:ItemStandard InstructionStandard InstructionStandard InstructionCuSO4·5H2O≥98%99%96%Cu≥25.06%25.3%24.5%Water-insoluble≤ ... industry (3) Chemical industry: Used in the manufacture of copper salt leaching, copper chloride, cuprous chloride and cuprous oxide, etc. (4 ...