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Industrial Grade Sodium Sulfite Water Treareductant  ISO 9001 SGS

Industrial Grade Sodium Sulfite Water Treareductant  ISO 9001 SGS

  • Industrial Grade Sodium Sulfite Water Treareductant  ISO 9001 SGS
  • Industrial Grade Sodium Sulfite Water Treareductant  ISO 9001 SGS
  • Industrial Grade Sodium Sulfite Water Treareductant  ISO 9001 SGS
Industrial Grade Sodium Sulfite Water Treareductant  ISO 9001 SGS
Product Details:
Place of Origin: Hunan
Brand Name: Kemsky
Certification: ISO 9001 SGS
Model Number: sodium sulfite anhydrous -reductant
Payment & Shipping Terms:
Minimum Order Quantity: 1 metric ton
Price: usd 430 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: Reductant SSA Sodium Sulfite Other Name: Reductant SSA Sodium Sulphite Anhydrous
Usage: Reductant Agent Mocular: Na2SO3
CAS NO: 7757-83-7 Purity: 97%
High Light:

sodium sulfite photography


sodium sulfite food grade



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



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.

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.

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



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

Molecular Formula : Na2SO3

Molecule Weight : 126.04

CAS NO .: 7757-83-7

Appearance : White Free Flowing Fine Crystal or Powder

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.

Sodium sulphite


Product specifications:

Formula: Na2SO3

The product is manufactured in the following grades:

  • Food
  • Technical
Applications: 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.





Industrial Grade Sodium Sulfite Water Treareductant  ISO 9001 SGS 0

Contact Details

Contact Person: Mrs. Kim Xie

Fax: Ningbo Keyuan Holdings Group

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