Physical properties: product is white crystalline powder, specific gravity 2.633, soluble in water was alkaline, soluble in ethanol, chlorine, exposed to air easily oxidized into sodium sulfate, the product uses thin-film contents, jacket bags packed. Uses: 1, for the man-made fiber stabilizer. 2, for the fabric bleach. 3, for the photographic industry, the reagent. 4, the food industry as preservatives, vegetable preservative. 5, leather industry. 6, mining for ore-dressing agent. 7, the chemical industry as a reducing agent, the production of raw materials Haibo. 8 =, organic synthesis, the introduction of sulfur-based, all as dyes, pigments. 9, also used in paper making industry, electroplating industry, foundry industry, pharmaceutical industry, etc.