... znso4 solubility 1,high Zinc content with low heavy metal 2,free sample 3,SGS,BV,CIQ inspection welcoming Specificationszinc sulfate ... solubility 1,high Zinc content with low heavy metal 2,free sample 3,SGS,BV,CIQ inspection welcomingzinc sulfate ... 7446-19-7 / 7446-20-0 H.S. Code: 28332930005. EINECS: 231-793-36. physical characteristics: White powder or crystal, easily soluble ...