Salts & Minerals
REACH
Sodium thiosulfate pentahydrate
CAS Number
10102-17-7
EC Number
600-156-5
What is Sodium thiosulfate pentahydrate?
Sodium thiosulfate pentahydrate (CAS 10102-17-7), also known commercially as antichlor, is an inorganic salt used as a reducing and dechlorination agent.
Where is Sodium thiosulfate pentahydrate used?
- Water treatment: dechlorination of municipal and process water prior to discharge
- Pharmaceuticals: antidote formulation ingredient and stabilizer in injectable preparations
- Textile and paper: neutralizes residual chlorine after bleaching, preventing fiber or pulp damage
- Food processing: antioxidant and dough conditioner for direct food contact
- It neutralizes excess oxidants in solution.
Commercial specifications
- Purity typically 99% or higher
- Packaging from small drums to bulk supersacks
Other Names (Synonyms)
Disodium thiosulfate pentahydrate|Thiosulfuric acid (H2S2O3), disodium salt, pentahydrate|Antichlor|RefChem:931939|Thiosulfuric acid (H2S2O3), sodium salt, hydrate (1:2:5)|Thiosulfuric acid, disodium salt, pentahydrate|Hypo
What are the physical properties of Sodium thiosulfate pentahydrate?
Melting Point 48.5 °C
Boiling Point 100 °C
Density 1.6 g/cm³
Appearance translucent crystals or white powder
Color White tranparent
Odor Odorless
Form Solid
Water Solubility 680 g/L (20 ºC)
Refractive Index 1.489
pH 6.0-7.5 (100g/l, H2O, 20℃)
Log P -0.428 (est)
Which trade and regulatory codes apply to Sodium thiosulfate pentahydrate?
HS Code 28323000
Storage Class 11 - Combustible Solids
WGK (Germany) 1