Items Standards Appearance White to tan crystalline powder Indentification Meet the requirements Purity,% 98.0-102.0 Loss on drying,% 0.50max Reducing substances,% 0.50max Heavy metals, ª¦g/g 10max As, ª¦g/g 1max Sulphate, % 0.02max Chloride, % 0.02max Lead, ª¦g/g 1max Clarity colorless PH 6.5-7.8. 25KG OR 1000KG PER BAG.