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EC No 231-821-9 Sodium Sulfite Food Grade & Industrial Grade White Crystalline Powder

EC No 231-821-9 Sodium Sulfite Food Grade & Industrial Grade White Crystalline Powder

  • EC No 231-821-9 Sodium Sulfite Food Grade & Industrial Grade White Crystalline Powder
  • EC No 231-821-9 Sodium Sulfite Food Grade & Industrial Grade White Crystalline Powder
EC No 231-821-9 Sodium Sulfite Food Grade & Industrial Grade White Crystalline Powder
Product Details:
Place of Origin: Hunan
Brand Name: Kemsky
Certification: ISO 9001
Model Number: sodium sulfite preservative
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: Sodium Sulfite SSA Other Name: Anhydrous Sodium Sulphite
Shelf Life: 2 Years Grade: Food Grade
Usage: Preservative Mocular: Na2SO3
High Light:

sodium sulfite anhydrous


sodium sulfite oxygen scavenger







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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


Physical and chemical properties:
White crystalline or powder form; triangular prism crystal shape; alkaline water solution with pH at 9 – 9.5; The highest water solubility is about 28% with temperature at 33.4°C. When exposed to air, it is oxidized to form sodium sulfate. When heated to high temperature, it decomposes to form sodium sulfide; Density: 2.633(15.4°C), Refractive Index: 1.565; Molecular Weight: 126.04.


It is used in dyeing industry as deoxidizer and bleaching agent for a variety of cotton fabric treating and scouring, which can prevent fabrics from local oxidation and deterioration of fibre strength. In photographic industry it is used as a reagent. In organic industry it is used as reducing agent in production of m-phenylenediamine, 25 - bared oxazolone, amino salicylic acid, etc. Textile industry uses it as a stabilizer for synthetic fibre. Other applications include various uses in paper mills, electronic industry, water treatment, etc.




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Basic information

Product Name: Sodium sulfite
Synonyms: Sodium sulfite anhydrous;SODIUM SULFITE, EXSICCATED;SODIUM SULPHITE;anhydroussodiumsulfite;disodiumsulfite;exsiccatedsodiumsulfite;natriisulphis;natriumsulfid
CAS: 7757-83-7
MF: Na2O3S
MW: 126.04
Product Categories: Inorganic Chemicals;Inorganics;Water Ttreatment Chemicals;Analytical Reagents for General Use;Disulfide Bridge Cleavage Reagents;Denaturation;Synthetic Reagents;ACS GradeBiochemicals and Reagents;Synthetic Reagents;inorganic compound;Paper, glass, printing and dyeing
Mol File: 7757-83-7.mol


Chemical Properties


melting point 500 °C
density 2.63
refractive index 1,484
storage temp. Store at RT.
solubility H2O: 1 M at 20 °C, clear, colorless
Water Solubility 23 g/100 mL (20 ºC)
Sensitive Hygroscopic
Stability Stable. Incompatible with strong acids. Moisture and air sensitive.

Technical specification


Index name

Analytically pure-AR Chemical pure-CP High purity
Content(Na2SO3) ≥97.0 ≥95.0 ≥96.0
Clarity test Qualified Qualified  
Water insoluble ≤0.005 ≤0.01 ≤0.03
Sulphurous acid( counted by Na2HSO3 ) Qualified Qualified  
Free alkali( counted by Na2CO3 ) ≤0.1 ≤0.3 ≤0.5
Chloride(Cl) ≤0.005 ≤0.02 ≤0.05
Thiosulfuric acid(S2O3) ≤0.01 ≤0.02 ≤0.04
Ferrum(Fe) ≤0.0005 ≤0.002 ≤0.003
Heavy metal(counted by Pb) ≤0.001 ≤0.002 ≤0.003
Arsenic(As) ≤0.0001 ≤0.0005 ≤0.001





Anhydyous sodium sulphite
English name Anhydyous sodium sulphite
Molecular formula Na2SO3
Technical specifications High purity grade Refined grade Photographic grade Industrial grade Industrial grade Industrial grade
Sodium sulfite Sodium sulfite Sodium sulfite High-class product High-class product First grade product
Na2SO3 ≥ % 98 98 97 98 97 96
Fe ≤ % 0.0005 0.002 0.005 0.003 0.003 0.005
Water insoluble ≤ % 0.005 0.01 0.05 0.02 0.02 0.03
Free alkali ≤ % 0.1 0.3 0.15 0.1 0.1 0.4
Sodium sulfate ≤ % 1.5 1.5 1.5 2.5
Sodium chloride ≤ % 0.005 0.02 0.01 0.1
Heavy metal on Pb≤ % 0.001 0.002 0.002
As ≤ % 0.0001 0.0005
Sodium thiosulfate ≤% 0.01 0.02 0.03
Aqueous solution appearance Qualified Qualified Qualified
Reaction of silver nitrate ammonia solution Qualified


1.Grade Food grade
2.Purity 97%
3.Molecular formula Na2SO3
5. CAS No 7757-83-7
6. HS CODE 28321000
7. EINECS No 231-821-4


Packing : External packing is PP woven bag, Internal packing is PE bag,25 kgs, 50 kgs, 1000 kgs, and 1250 kgs bag packing.

Storage & defence: Stored in cool and dry place, avoid moisture and heat. No breakage, No mixed with oxidant and toxic matter. The storage period is 6 month since the production date. It should be transported by clean car, with covering matter, avoid rain.



The role of anhydrous sodium sulfite is extensive, it is in the pharmaceutical industry, paper making, leather tanning and dyeing industries and plant fiber bleaching, food, etc have a very important role. Addition of anhydrous sodium sulfite is also used to film developing, bleaching agents, printing and dyeing industry as a deoxygenation agent.


White crystal or powder; no foul. Soluble in water, very slightly soluble in ethanol, almost insoluble in ether. White hexagonal prismatic crystals, soluble in water (0 ℃ 12.54g/100ml water; 80 ℃ when the 283g/100ml water), in 33.4 ℃ The maximum solubility of about 28% when the aqueous solution is alkaline, PH value is about 9 ~ 9.5 . Slightly soluble in alcohol, insoluble in liquid chlorine, ammonia. Easily oxidized in air sodium, when the temperature is decomposed into sodium sulfide. To strengthen the reducing agent, reacts with sulfur dioxide, sodium bisulfite, reacted with the acid salt.





EC No 231-821-9 Sodium Sulfite Food Grade & Industrial Grade White Crystalline Powder 0

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