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- Product Identification
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CAS No. :
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7757-83-7
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EINECS No. :
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231-821-4
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H.S. Code :
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2832.100000
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Formula :
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Na2SO3
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Molecular Weight :
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126.04
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Toxicity :
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Oral mouse LD50: 820 mg/kg
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Synonyms :
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Sodium Sulfite Anhydrous; Disodium Sulfite; Natrii Sulphis; Natrium Sulfurosum;
Natriumsulfit (German); Sulfurous Acid, Disodium Salt;
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- Physical And Chemical Properties
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Physical State :
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White crystalline powder
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Melting Point :
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Decomposes
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Specific Gravity :
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2.633
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Solubility in water :
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good
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PH :
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9
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Vapor Density :
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4.35
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NFPA Ratings :
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Health: 1 Flammability: 0 Reactivity: 0
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Stability :
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Stable under ordinary conditions
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- Applications
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- Pharmaceutical industry for the production of chloroform, benzene, styrene sulfone, formaldehyde.
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- Rubber industry as a coagulant.
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- Bleached cotton printing and dyeing industry as the dechlorination agent, cotton scouring agent.
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It can prevent the partial oxidation of cotton cloth fiber and influence the fiber strength.
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- Leather tanning industry for processing，make the leather soft, plump, tough, waterproof, bending,
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wear and other properties.
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- The chemical industry for the production of vanillin hydroxyl, hydroxylamine hydrochloride and so on.
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- Photographic Industry as a developer, etc.
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- The food industry as a bleaching agent, preservatives, leavening agent, antioxidant, color agents
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and the insurance agent. as reducer in producing dehydration vegetables.
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- Electronics industry for the manufacture of photosensitive resistance.
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- Paper-making, Electronic, Water-treatment for electroplating wastewater, drinking water, etc.
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- Specification
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Testing Items
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Quality Standard – Type (1)
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Quality Standard – Type (2)
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Appearance :
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White crystalline powder
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White crystalline powder
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Purity – NA2SO3 :
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97% Min
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93% Min
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Water Insoluble :
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0.02% Max
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0.03% Max
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Fe :
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0.003% Max
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0.005% Max
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Free Alkali, as NA2CO3 :
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0.1% Max
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0.4% Max
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Sulphates, as NA2SO4 :
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2.5% Max
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-
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Chlorides, as NACL :
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0.1% Max
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-
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- Transportation
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Storage :
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Stored in cool and dry place, avoid moisture and heat
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Packing :
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In 25kgs /50kgs /1000kgs net p.p. woven bags
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- Other Trade Information
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Min. Order Quantity :
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25 MTS
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Supply Capacity :
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22,000Mts /Year
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Loading Capacity :
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27Mts/1080Bags (1x20'FCL)
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Port of Loading :
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Huangpu / Hengyang / Tianjin, China
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Fresh Stocks :
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Yes
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Ref. Price :
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USD305.- ~ USD520.- /MT FOB Huangpu / Tianjin, China
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Shipment Time :
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Within 2-3 weeks upon receipt of advance payment or L/C .
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Payment Terms :
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T/T, L/C ( Sight / 90days ), D/P, Western Union
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Origin :
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Hunan, Tianjin
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Sample Availability :
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Yes
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Main Export Markets :
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India, Indonesia, Thailand, Pakistan, Bangladesh, Iran, Argentina, Turkey
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