Therelative density is 1.328~1.349, the melting point is 318.4 ° C, and theboiling point is 1390 ° C. Pure liquid caustic soda is called liquid causticsoda and is a colorless transparent liquid. It is an important chemical basicraw material and has a wide range of uses.

Inthe chemical industry, it is used to produce formic acid, oxalic acid, borax,phenol, sodium cyanide and soap, synthetic fatty acids, synthetic detergents,and the like.

Inthe textile printing and dyeing industry, it is used as a solvent for cottondesizing agents, scouring agents, mercerizing agents and vat dyes, and Haichangblue dyes.

Inthe smelting industry, it is used to produce aluminum hydroxide, aluminum oxideand metal surface treatment agents.

Inthe instrument industry, it is used as an acid neutralizer, a decolorizer, anda deodorizer. In the adhesive industry, it is used as a starch pasting agentand neutralizer. In addition, it is widely used in enamel, medicine, cosmetics,leather, paint, pesticide, glass and other industries.