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CAS 7681 57 4 Sodium Sulfite Molecule Weight 126.04 EC No 231-821-12

CAS 7681 57 4 Sodium Sulfite Molecule Weight 126.04 EC No 231-821-12

    • CAS 7681 57 4 Sodium Sulfite Molecule Weight 126.04 EC No 231-821-12
    • CAS 7681 57 4 Sodium Sulfite Molecule Weight 126.04 EC No 231-821-12
  • CAS 7681 57 4 Sodium Sulfite Molecule Weight 126.04 EC No 231-821-12

    Product Details:

    Place of Origin: Hunan
    Brand Name: Kemsky
    Certification: ISO 9001 SGS
    Model Number: sodium sulfite anhydrous -ss

    Payment & Shipping Terms:

    Minimum Order Quantity: 1 metric ton
    Price: usd 510 per metric ton
    Packaging Details: 25 kgs bag,1000 kgs big bag
    Delivery Time: 5-8 days
    Payment Terms: T/T , L/C
    Supply Ability: 3000 tons per month
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    Detailed Product Description
    Name: SS Antichlor Sodium Sulfite Other Name: SS Antichlor Sodium Sulphite Anhydrous
    Grade: Food And Tech Grade Usage: Industrial Bleaching Agent,water Treatment Antichlor
    CAS NO: 7757-83-7 Purity: 97%




    Packing: Packed in 25kg plastic woven bag, Kraft paper bag, PE bag, 500kg/1000kg/1100kg/1200kg jumbo bag or as per the buyer’s requirement


    Storage: Store the product in a dry and cool place.


    Application :

    (1) Industry Grade : Used in Dyeing and printing Industry ,as dechlorinating agent and bleaching agent, in leather and tanning industry as bleaching agent , developer agent , reductant agent , stabilizer agent , or used in papermaking, electronic and water treatment industry.

    (2) Food Grade: In food industry as additive (E223) preservative, antioxidant and antimicrobic for fruits (dried, glazed and candled), vegetables (onions, potatoes, etc.), juices (citrus and grapes) and fish (shrimps and prawns). In silage treatment as antifermentative. In starch and sweeteners production as bacteriostatic.

    (3) Photo Grade: In the photographic industry as component of developer bath .

    (4) Pharmaceutical Grade : pharmaceutical industry for the production of chloroform, benzene and formaldehydephenylpropanoid Sulfone



    Sodium Sulfite Anhydrous

    Property: white gravel or powder crystal,relative density is 1.561, less to dissolve in water and its water solution has alkaline reaction; it is hard to dissolve in ethanol. It is used to produce chloroform,solasulfone and Benzaldehyde in medical industry.

    Molecular Formula : Na2SO3

    Molecule Weight : 126.04

    CAS NO .: 7757-83-7

    Appearance : White Free Flowing Fine Crystal or Powder

    Specification for Industry Grade and Food Grade :

    Item Quality Index
    Industry Grade Food Grade
    Purity ( As Na2SO3) 96.0% min 98.0% min
    Sodium sulphate ( SO4) 2.0% max 1.0% max
    Chlorides ( As NaCL) 0.5% max 0.1% max
    Arsenic ( As ) - 0.0002% max
    Heavy metals ( As Pb ) - 0.0005% max
    Iron (Fe) 0.005% max 0.002% max
    Water insolubles 0.05% max 0.02% max


    Specification For Photo Grade and Pharmaceutical Grade

    Item Quality Index
    Photo Grade Pharmaceutical Grade
    Purity ( As Na2SO3) 98.0% min 98.0% min
    Sodium sulphate ( SO4 ) 1.0% max 1.0% max
    Chlorides ( As CL-) 0.05% max 0.05% max
    Arsenic ( As ) 0.0002% max 2ppm max
    Lead ( As Pb) 0.0005% max 2ppm max
    Iron (Fe) 0.001% max 5ppm max
    Selenium ( Se) 0.0001% max 1ppm max
    Zinc ( Zn) 0.0001% max 1ppm max
    Copper ( Cu ) 0.0001% max 0.1ppm max
    Mercury ( Hg) 0.0001% max 0.1 ppm max




    Sodium sulfite  
    Other names  
    Hypo clear(photography)  
    CAS Number · 7757-83-7
    3D model (JSmol) · Interactive image
    ChEBI · CHEBI:86477
    ChemSpider · 22845
    ECHA InfoCard 100.028.929
    EC Number 231-821-4
    E number E221 (preservatives)
    PubChem CID · 24437
    RTECS number WE2150000
    Chemical formula Na2SO3
    Molar mass 126.043 g/mol
    Appearance white solid
    Odor odorless
    Density 2.633 g/cm3 (anhydrous)
    1.561 g/cm3 (heptahydrate)  
    Melting point 33.4 °C (92.1 °F; 306.5 K) (dehydration of heptahydrate)
    500 °C (anhydrous)  
    Boiling point Decomposes(separate (substances) into constituent elements)
    Solubility in water 27.0 g/100 mL water (20 °C)
    Solubility soluble in glycerol insoluble in ammonia,chlorine
    log P -4
    Acidity (pKa) ~9 (heptahydrate)
    Refractive index(nD) 1.565
    Crystal structure hexagonal (anhydrous)
    monoclinic (heptahydrate)  
    Safety data sheet ICSC 1200



    Sodium sulphite


    Product specifications:

    Formula: Na2SO3

    The product is manufactured in the following grades:

    • Food
    • Technical

    Pulp and paper
    In the production of pulp by sulphite semi-chemical process and chemi-thermo mechanical means
    Water treatment
    As an antichlor
    Boiler water
    As an oxygen scavenger
    Chemicals and drugs
    A moderate reducing agent in the manufacture of sodium thiosulphate, sulphonated chemicals, sulphomethylation, and acetaminophen
    Natural latex rubber
    As a preservative
    As a preservative
    Food industry
    As an antioxidant, enzyme inhibitor and anti-microbial agent
    Fibre industry
    As a solvent for raw materials, an additive for precipitation baths, for bleaching and for desulphurising bobbins
    To destroy chlorine in return brine
    Leather industry
    In the sulphitisation of tanning extract
    In the production of trinitrotoluene (TNT)
    Oil well floatation as an oxygen scavenger
    In the manufacture of sulphosuccinates and shampoo

    Packaging / transportation
    • 25kg polypropylene woven / paper bags with heat sealed inner liner
    • 25kg HDPE bags
    • 500kg, 1,000kg, 1,100kg bulk sacks

    Locally, it is transported in six-wheeler, 10-wheeler and trailer trucks. Internationally, it is transported in 20' containers. The maximum stuffing is 27Mt. / 20' fcl.



    SS is used as an antichlor in water treatment and desalination plants; in the reduction of wastewater in chrome-plating industry; as a preservative in the manufacture of trinitrotoluene (TNT); as a bleaching agent and for scrubbing sulphur dioxide gas in pulp mills in power plants and for leather treatment.
    It is also used as an oxygen scavenger in low-pressure boilers and in the manufacture of detergent, sodium thiosulphate and photographic chemicals.


     CAS 7681 57 4 Sodium Sulfite Molecule Weight 126.04 EC No 231-821-12

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