White uniform particles or powder. Odorless, taste bitter. Bring salty, 2.68 g/cm3 density. Melting point ℃ 884. Soluble in water, solubility in the 0 - ℃ 30.4 within with temperature rise rapidly increases. Soluble in glycerin, not soluble in alcohol. Aqueous show neuter. When water solution 32.38 ℃ is less than ten to water content crystallization precipitation. Above 32.38 ℃ begin with anhydrous crystalline sodium NSW.
Applications mainly used dyes and additives of filling agent to adjust dyes and auxiliaries concentration, make can reach the standard density. Also used for direct dyes, vulcanization dye, reduction dyes in dyeing cotton of promoting dye, direct acid dyes in dye the silk and wool of animal fiber inhibition dye, also can be used as printing soybean-protein refining the impression of protectants when etc. The papermaking industry used for the manufacture of sulphate pulp cooking agent. The pharmaceutical industry as BeiYan poisoning when the antidote. In addition, also used in the glass, building industry, etc.