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Sodium Thiosulfate Pentahydrate

Item	Details
CAS No.	10102-17-7
Molecular Formula	Na2O3S2·5H2O
Molecular Weight	248.18
Appearance	Colorless transparent monoclinic crystals or white crystalline particles, free of impurities, yellowing and agglomeration
Melting Point	48.5℃ (loses crystal water upon heating)
Solubility	Highly soluble in water, aqueous solution weakly alkaline; insoluble in organic solvents such as ethanol and ether
Stability	Stable in dry environment at room temperature; decomposes rapidly at high temperature and in strong acid to generate sulfur dioxide and sulfur precipitate; prone to slow oxidation and deterioration under light and long-term air exposure; hygroscopic in humid environment; store sealed and away from light
HS Code	2832300000 (Thiosulfates)
Packing	Woven bag lined with PE inner film, plastic drum, mainstream specification: 25kg; outer package marked with labels for moisture-proof, light-proof and keep away from acidic substances, general industrial packaging
Storage Conditions	Store in cool, dry and ventilated warehouse, ambient temperature ≤30℃, relative humidity ≤65% RH; fully sealed and away from light, isolate air and acidic materials; do not mix with strong acids and oxidants; use up quickly after opening, seal remaining materials for moisture and oxidation protection
Personal Protection	Wear dust mask, rubber gloves and goggles during operation; avoid massive dust inhalation and prolonged skin contact; keep operation site ventilated
Waste Disposal	Neutralize waste liquid via acid-base neutralization before compliant discharge; recycle solid waste as general industrial solid waste; do not pour directly into rivers and soil; avoid mixing with acidic waste
Application Fields	Photography / imaging industry; textile printing and dyeing industry; water treatment industry; electroplating industry; chemical analytical reagents; leather processing; pharmaceuticals and daily chemicals; mineral processing and metallurgy; food processing