purity99.6%min for medicine,printing,leather,textile,Metallurgy industry white ... two crystal water,Melting point: 101-102oC, specific gravity: 1.653, easily sublimate at 100oC, easily dissolve in alcohol ... and water.SpecificationItemsStandardPurity99.6%min.Sulphate SO420.08%max.Heavy metals (Pb+)0.001 ... bag with inner PE bag 25kgs net. Refined 99.6 %min oxalic acid