SODIUM SULFITE- ▸ Boiler and oilfield water: Oxygen scavenger in boiler feedwater and oil wells.
- ▸ Bleaching: Antichlor for dechlorinating textiles and paper pulp.
- ▸ Photography: Reducing agent in photographic developers.
- ▸ Dye manufacture: Reducer and solubilizing agent for dyes.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Sodium sulfite (CAS 7757-83-7) is an inorganic sulfite and reducing agent. HSDB documents its use in photographic developers, textile and paper bleaching as an antichlor, in dye manufacture, and as an oxygen scavenger in boiler-water and oilfield treatment. It also silvers glass and removes traces of chlorine from bleached textiles and paper.
Frequently Asked Questions
What is sodium sulfite anhydrous used for?
Sodium sulfite (CAS 7757-83-7) is an inorganic sulfite and reducing agent used as an oxygen scavenger in boiler feedwater and oilfield water treatment, as an antichlor for dechlorinating bleached textiles and paper pulp, as a reducing agent in photographic developers, and as a reducer and solubilizer in dye manufacture.
What is the difference between sodium sulfite and sodium bisulfite?
Sodium sulfite is Na2SO3; sodium bisulfite (sodium hydrogen sulfite) is NaHSO3, the more acidic, partially protonated form. Both act as reducing agents and oxygen scavengers, but they differ in solution pH and active SO2 content. We supply this product as the anhydrous technical granular sulfite, CAS 7757-83-7.
Is sodium sulfite soluble in water?
Yes. The anhydrous technical granular grade dissolves readily in water to give a mildly alkaline solution, which is why it is dosed into boiler and oilfield water as an oxygen scavenger. Refer to the SDS for handling data.
What HS code applies to sodium sulfite?
Sodium sulfite is classified under HS heading 2832.10 (Sulfites; thiosulfates: sodium sulfites). Confirm the destination tariff line with your customs broker before shipping.
What is the cost of bulk sodium sulfite anhydrous?
Pricing for the anhydrous technical granular grade depends on order volume and packaging (bags, supersacks, or bulk). Submit a bulk RFQ with your quantity and delivery point and we will return a current quote with Certificate of Analysis and SDS.