Sell Zinc sulfate heptahydrate

Description

Zinc sulfate heptahydrate Molecular formula: ZnSO4.7H2O Properties: white granule or powder, orthorhombic system. Uses: the material of lithopone and zinc salt; auxiliary material of viscose and vinylon. Or used as mordant, conservant and bactericide, or used in plating, flotation, disease of fruit and treatment of recirculated cooling water and fertilizer Standard:HG/T ********5 Item Index Top-grade First grade Qualified product Main assay Mass fraction (based on Zn), % ≥ *2.*1 *2.*6 *0.*2 Mass fraction (based on ZnSO4.H2O ), % ≥ - - - Mass fraction (based on ZnSO4.7H2O ), % ≥ *9.0 *7.0 *2.0 Mass fraction of insoluble matter, % ≤ 0.*2 0.**0 0.*0 pH (*0g/L Solution ) ≥ 3.0 3.0 - Mass fraction of chloride, % ≤ 0.*0 0.*0 - Mass fraction of Pb, % ≤ 0.**1 0.**0 0.**0 Mass fraction of Fe, % ≤ 0.**3 0.**0 0.**0 Mass fraction of Mn, % ≤ 0.**5 0.*0 - Mass fraction of Cd, % ≤ 0.**1 0.**0