5–8 mm Big Granules Sodium Thiosulfate Pentahydrate is readily soluble in water and turpentine, while being only slightly soluble in ethanol. Its aqueous solution shows a mildly alkaline reaction. When exposed to strong acids, it decomposes and releases sulfur, exhibiting strong reducing properties.
This product is widely used as a photographic fixing agent, dechlorinating agent, and analytical reagent. It also plays an important role in chrome tanning for leather processing and in the extraction of silver from ores.
In addition, Sodium Thiosulfate Pentahydrate has recognized applications in pharmaceutical and medical fields, where it is used in formulations related to anti-allergic treatment and detoxification processes, including applications involving cyanide and arsenic compounds.
Sodium Thiosulphate Pentahydrate
Other Names: Sodium Hyposulfite;Hypo
Molecule Formula: Na2S2O3 ·5H2O
Molecular Weight: 248
CAS No.:10102-17-7
EINECS No. 231-867-5
This product appears as colorless, transparent monoclinic crystals with a specific gravity of 1.729. It is readily soluble in water and demonstrates strong reducing properties.
sodium thiosulphate:99%min
insoluble substance in water:0.01%max
sulphate(Na2S):0.001%max
Fe:0.002%max
Ph value:6.5-9.5
| Item | Photographic grade | Industrial grade | Anhydrous grade |
| Appearance | colorless transparent crystal | Colorless transparent crystal | white powder |
| Assay | ≥99.00% | ≥98.5% | ≥97.0% |
| Water Insoluble matter | ≤0.01% | ≤0.03% | ≤0.03% |
| Sulfide | ≤0.001% | ≤0.003% | ≤0.001% |
| Fe | ≤0.001% | ≤0.003% | ≤0.005% |
| PH | 6.5~9.5 | 6.5~9.5 | 6.5~9.5 |
| Water solution reaction | in accordance with the test | in accordance with the test | ---- |
| Granularity(g/g) | 12~16 | --- | ---- |
5-8mm Big Granules Sodium Thiosulfate Pentahydrate is a colorless or slightly yellowish transparent monoclinic crystal, easily soluble in water, chemically stable, and easy to store and transport.
Widely used in photographic fixing, electroplating processes, and leather processing industries, it can be used as an efficient reducing agent and dechlorinating agent.
Used as an auxiliary agent in the dyeing process of sulfur dyes, helping to improve dyeing stability and product quality.
5-8mm Big Granules Sodium Thiosulfate Pentahydrate is used as a rust inhibitor, suitable for metal surface treatment and industrial protection.
It can be used for disinfection and decolorization treatment, meeting various industrial application needs.
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