Properties:                                                 
pure product is colorless and transparent crystal
M.P. 318.4^οC
B.P. 1390^οC
relative density 2.130
easily soluble in water(release heat), soluble in ethanol and glycerol; insoluble in acetone and ether. If exposed in the air, it will be completely dissolved into solution.

Use: As basic chemical material widely used in chemical engineering, metallurgy, paper making, petroleum, textiles and daily-use chemical departments.