Sodium Thiosulfate

Detailed Product Information

Sodium Thiosulfate is a reducing agent used as a photographic fixer, dechlorinator, and in medicinals.

Formula: Na₂S₂O₃·5H₂O

CAS: 7772-98-7

Min. Order: 200KG

Molecular Weight: 248.18 (pentahydrate)

Melting Point: 48–50°C (decomposes)

Appearance: Colorless crystals or powder.

Application: Photography: Fixer to remove unexposed silver halide.

Water Treatment: Dechlorination.

Medicine: Antidote for cyanide poisoning.

Packaging: 25kg bags with moisture barrier.

Storage: Store in sealed, cool, dry conditions.

Transportation: Non‑hazardous; avoid moisture exposure.

Summary: An essential reducing salt in photography, water treatment, and emergency medicine.