Appearance: White crystalline powder Indentification: Meet the requirements Purity,%: 99.6min Loss weight on drying, %: 0.30max Residue on ignition, %: 0.01max Heavy metals,ug/g: 10max Pb, ug/g: 1max Fe, ug/g: 5max Cu, ug/g: 1max Mn, ug/g: 1max As,ug/g: 1max Sulphate,ug/g: 10max Chloride,ug/g: 10max Melting point,℃: 165-168 Color, APHA: 5 Max Clarity(5% water solution): Cloudless Clarity (20% DMSO): Cloudless