2. Materialization nature : The pure product is the colourless transparent crystal, relative density 2.130. 318.4 degrees Centigrade of points. 1390 degrees Centigrade of boiling point. The purely solid caustic soda is white, there are bulk , bar-shaped , granular, the quality is fragile ; The purely liquid caustic soda is the colourless transparent liquid. The solid caustic soda has very strong hygroscopicity. Apt to dissolve it in water, send out heat when dissolving, the aqueous solution is alkaline, there are soft senses ; Dissolve it in the ethanol and glycerin; Do not dissolve it in the acetone , ether . Corrosivity is extremely strong, have function of corroding on fibre , skin , glass , pottery ,etc.. 3. Use: For the papermaking , production of cellulosic thick liquid and dregs of rice; Used in the soap , formate production of washing the silk ribbon pharmaceutical , formating the fatty acid and refinement moving the vegetable fat. Textile printing and dyeing industry use as rice cotton retreat the thick liquid pharmaceutical , boil and smelt the pharmaceutical and pharmaceutical of silky luster of mercerized cotton fabrics. The chemical industry is used for producing borax , Cymag , formic acid , oxalic acid , phenol ,etc.. The petroleum industry is used for refining the petroleum products, is used in the well drilling mud in the oil field.
