Sodium Thiosulfate
Disodium Thiosulfate, Sodium Hyposulfite
- CAS
- 7772-98-7
- EC
- 231-867-5
- Sectors
- Water & Wastewater Treatment, Mining & Metals, Pharma & Healthcare
Sodium thiosulfate, also known as hypo, is a white crystalline solid with formula Na2S2O3 and molecular weight 158.11 g/mol (anhydrous). Density 1.67 g/cm³, melting point 48°C (pentahydrate); highly soluble in water, hygroscopic. Produced by boiling sodium sulfite with sulfur.
SoleChem, an ISO 9001:2015 certified chemical supplier based in Türkiye, delivers Sodium Thiosulfate (CAS 7772-98-7) to customers in more than 40 countries.
Sodium Thiosulfate
Applications
Used in photography as fixer, water treatment for dechlorination, gold mining, medical antidote for cyanide, and textiles.
Safety & Risks
Low toxicity but irritates eyes, skin; releases toxic gases in fire. Avoid oxidizers; use PPE.
Packaging
In 25kg bags or drums; rinse triply for recycling or reconditioning.