Sodium Thiosulphate 40% (Na₂S₂O₃) is a clear, colorless aqueous solution of sodium thiosulphate widely used as a reducing and dechlorinating agent. It is highly soluble in water and valued for its ability to neutralize residual chlorine and other oxidizing substances. Common applications include water treatment for dechlorination, photographic processing as a fixing agent, and chemical manufacturing as a reducing reagent. It is also used in mining and laboratory processes requiring controlled reduction reactions. The solution is trusted for its effectiveness, stability, and reliable performance across industrial and environmental applications.
| Property | Specification |
|---|---|
| Product Name | Sodium Thiosulphate 40% |
| CAS No | 7772-98-7 |
| Chemical Name/Synonyms | Sodium Thiosulfate Solution 40%; Hypo 40%; Na2S2O3 40% |
| Chemical Formula | Na₂S₂O₃ |
| Appearance (Color) | Clear colorless aqueous solution |
| Molecular Weight | 158.11 g/mol (anhydrous) |
| HS Code | 2832.30 |
| TSCA Inventory | Active |
More identifiers
| |
| Property | Typical Classification |
|---|---|
| GHS Signal Word | Not classified |
| UN Number | Not regulated as dangerous goods |
| Flash Point | Not applicable |
Typical U.S. classification for this product: label elements under OSHA’s Hazard Communication Standard (29 CFR 1910.1200) and transport under U.S. DOT (49 CFR 172.101), compiled from manufacturers’ safety data sheets and harmonised GHS classifications, checked October 2026. Environmental hazards are shown for information; the OSHA label does not cover them. Classification can differ by supplier, grade and concentration: the supplier’s U.S.-format SDS, sent with your quote, is the governing document.
Optimizes manufacturing efficiency and streamlines complex chemical operations.
Provides superior results tailored to specific industrial requirements.
Rigorously tested to ensure high purity, consistency, and reliable outcomes.
Formulated to meet strict industrial safety and environmental standards.
Highly concentrated formulation reducing overall usage and operational costs.
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Consistent quality and international standards.
Bulk availability with on-time delivery.
Flexible packaging options as per requirement.
Technical guidance and dedicated customer support.
