SODIUM THIOSULFATE- ▸ Dechlorination: Antichlor in water and wastewater treatment.
- ▸ Photographic fixer: Dissolves silver halides in film and print processing.
- ▸ Leather: Reducer in chrome tanning.
- ▸ Textiles: Mordant in dyeing and printing.
- ▸ Metal recovery: Agent in silver extraction from ores.
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 thiosulfate (CAS 7772-98-7) is an inorganic thiosulfate salt. HSDB documents its use as a photographic fixer that dissolves silver halides, as an antichlor for dechlorinating bleached paper and textiles, in wastewater treatment to reduce chlorine and chromium, in chrome leather tanning, and as a mordant in dyeing and printing. It also serves as a sequestrant in salt.
Frequently Asked Questions
What is sodium thiosulfate used for?
Sodium thiosulfate (CAS 7772-98-7) is an inorganic thiosulfate salt used as an antichlor for dechlorinating water and wastewater, as a photographic fixer that dissolves silver halides, as a reducer in chrome leather tanning, as a mordant in textile dyeing and printing, and as an agent in silver extraction from ores.
What is another name for Na2S2O3?
Sodium thiosulfate (CAS 7772-98-7) is historically known as hypo or sodium hyposulfite, a name carried over from its long use as a photographic fixer. It is commonly supplied as the pentahydrate. Each lot ships with a Certificate of Analysis.
Is sodium thiosulfate soluble in water?
Yes. Sodium thiosulfate is highly water-soluble, and the pentahydrate dissolves with a cooling (endothermic) effect. Its solubility underpins its use in dechlorination and photographic fixing. See the SDS for handling details.
What HS code is used for sodium thiosulfate?
Sodium thiosulfate is classified under HS heading 2832.30 (Sulfites; thiosulfates: thiosulfates). Verify the destination-country tariff line with your broker prior to export.
What is the cost of bulk sodium thiosulfate?
Bulk pricing depends on form (pentahydrate crystal vs. anhydrous), assay, and volume. Submit a bulk RFQ with quantity and destination and we will return a current quote with CoA and SDS.