Inorganic Salts
Sodium Sulfite, Anhydrous, 98% NSF
Granular oxygen scavenger and reducing agent for industrial processes.
- Article code
- SS1523A
- CAS
- 7757-83-7
- Category
- Inorganic Salts
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Properties
- Article / SKU
- SS1523A
- Chemical Name
- Sodium Sulfite, Anhydrous
- Chemical Formula
- Na2SO3
- CAS Number
- 7757-83-7
- Molecular Weight
- 126.04 g/mol
- Sodium Sulfite (Na2SO3)
- 97.0 – 100.0 %
- Alkalinity (as Na2CO3)
- 0.0 – 0.5 %
- Sodium Sulfate (Na2SO4)
- 0.0 – 2.5 %
- Chlorides (Cl)
- 0.0 – 0.02 %
- Heavy Metals (as Pb)
- 0.0 – 20 ppm
- Iron (Fe)
- 0.0 – 15 ppm
- Water Insolubles
- 0.0 – 100 ppm
- pH (1% Solution)
- 9.7 – 10.3
- Appearance
- White to Pale Yellow
- Physical State
- Solid, Free-Flowing Granular Crystal
- Relative Density
- 2.63
- Bulk Density
- ≈ 95 lb/ft³
- pH (5% Solution)
- ≈ 10.1
- Solubility in Water
- 17% at 10°C; 28% at 33.3°C
- Decomposition Temperature
- 900°C
- Shelf Life
- Nominally 36 months when properly stored in original packaging
- Storage Conditions
- Store in a cool, dry, well-ventilated indoor environment. Keep away from acids and oxidizing agents.
Packaging options
- 1 Lb
- 10 Lbs
- 50 Lbs
- 2 Lbs
Details
Sodium Sulfite, Anhydrous is an inorganic compound supplied as a free-flowing granular crystal, white to pale yellow in color, odorless, and readily soluble in water. It is a versatile reducing agent valued across industrial processes for its ability to scavenge oxygen, neutralize oxidizing agents, and act as a sulfonating agent. Its granular, free-flowing form makes it easy to dose, handle, and dissolve into solution.
Used as a pulping agent in chemimechanical, chemithermomechanical, and sulphite pulp production.
Removes dissolved oxygen from steam boiler water systems.
Removes excess chlorine from wastewater treatment processes.
Functions as a solubilizing agent in vegetable tanning.
Acts as a sulfonating agent in chemical manufacturing.
Serves as a reducing agent in polymerization and surfactant production.
Used as a reducing agent for dyes in textile processing.
Reduces chrome and other metals in industrial applications.
Acts as a preservative and antioxidant in photographic developer solutions.
Free-flowing granular form allows easy handling, dosing, and dissolution.
Not classified as hazardous under the Globally Harmonized System (GHS) and not regulated for transport by the US DOT. Reacts with acids to release sulfur dioxide (SO₂), a toxic and irritating gas. Incompatible with oxidizing agents and may generate strong exothermic reactions. May cause severe allergic reactions in sulfite-sensitive individuals. Avoid skin and eye contact and inhalation of dust. For NSF applications, the maximum usage level is 22 mg/L. For ozone reduction, use approximately 215 mg/L sodium sulfite per 100 mg/L ozone. Residual sulfite levels shall not exceed 100 ppm in finished water. Store in a cool, dry, well-ventilated area away from acids and oxidizers. Refer to the Safety Data Sheet (SDS) before use.