Property: Colorless transparent liquid, easily be absorbed by skin,freezing point is -42.53 ,boiling point is 204 Quality standard:Q/320621DBA-2001 Item Index Content % 98 Refractive index 1.435-1.437 Iron Fe3+ % 0.0002 Sulphate SO42- % 0.0005 Chloride Cl- % 0.0001 Range of specific gravity 1.125-1.128 Package: Packed in plastic barrel, the volume of which is 5kg/barrel,10kg/barrel,20kg/barrel and 25kg/barrel.