Specification: Zinc Sulphate Heptahydrate Zn 21%Min As 0.0005%Max Pb 0.0020%Max Cd 0.0030%MaxAppearance: White Crystal Powder. Package: In 25kg plastic woven bag with plastic liner inside Usage: As Zinc additive in feed-processing, activator in latex paper; Trace nutrient in animal feeds; Fertilizer ingredient; Zinc salts; Ore flotation; Fungicide; Water purification.