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food additive sodium sulfite fruit preservative SSA white crystalline power 97% HS code:28321000

food additive sodium sulfite fruit preservative SSA white crystalline power 97% HS code:28321000

  • food additive sodium sulfite fruit preservative  SSA white crystalline power 97% HS code:28321000
  • food additive sodium sulfite fruit preservative  SSA white crystalline power 97% HS code:28321000
  • food additive sodium sulfite fruit preservative  SSA white crystalline power 97% HS code:28321000
food additive sodium sulfite fruit preservative  SSA white crystalline power 97% HS code:28321000
Product Details:
Place of Origin: Hunan
Brand Name: Kemsky
Certification: ISO 9001
Model Number: sodium sulfite fruit 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 Fruit Preservative Other Name: Anhydrous Sodium Sulphite Fruit Preservative
Grade: Food Grade For Food Industry Usage: Stablizer ,fruit Preservative
Packing: 25 Kgs Plastic Woven Bag Mocular: Na2SO3
High Light:

sodium sulfite anhydrous


sodium sulfite preservative






Sodium Sulfite Anhydrous


is a soluble sodium salt of sulfurous acid (sulphite) with the chemical formula Na2SO3.It is a white crystal powder or granule that tastes salty with sulphur odor.



1. Chemical Analysis

Component Range Typical
Na2SO3% ≥ 97.0 % 97.37%
Fe % ≤ 0.003% 0.003%
Water insoluble matter ≤ 0.02% 0.02%
Na2CO3 ≤ 0.10% 0.10%
Na2SO4 ≤ 2.5% 2.5%



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.


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.


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



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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.





food additive sodium sulfite fruit preservative  SSA white crystalline power 97% HS code:28321000 0


Contact Details

Contact Person: Mrs. Kim Xie

Fax: Ningbo Keyuan Holdings Group

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