Sodium Thiosulfate Powder, ≥99%
Product Description
AIC's high-purity sodium thiosulfate (≥99%) provides a reliable reducing and complexing agent for optical glass processing, semiconductor fabrication, photochemical workflows, and specialized water-treatment applications. Produced under controlled purity and particulate standards, the material delivers consistent solubility, low insoluble content, and stable reduction behavior, supporting reproducible performance in thin-film rinsing, silver-halide removal, redox control, and sensitive substrate handling.
Supplied as a free-flowing crystalline solid, the product is compatible with optical finishing operations, semiconductor wet-chemistry steps, photographic processing lines, and pool and aquatic dechlorination treatments where rapid chlorine reduction is required.
Specifications
| Property | Value |
|---|---|
| Chemical Name | Sodium Thiosulfate |
| Synonyms | Thiosulfuric acid sodium salt, Hypo |
| CAS Number | 7772-98-7 |
| EC Number | 231-867-5 |
| Purity | ≥99% |
| Form | Crystalline powder |
| Appearance | White, free-flowing crystals |
| Molecular Formula | Na₂S₂O₃ · xH₂O (typically pentahydrate) |
| Molar Mass | ~248.18 g/mol (pentahydrate basis) |
| Melting Point | ~48–50 °C (pentahydrate) |
| Boiling Point | Decomposes |
| Storage Conditions | Store tightly sealed, cool, and dry; hygroscopic—protect from humidity |
| Solubility | Highly soluble in water; insoluble in alcohols |
Applications
• Optical processing: silver-halide complexation, glass finishing, residue removal
• Semiconductor wet-chemistry: selective dissolution, thin-film rinsing, redox control
• Photochemical workflows: fixer formulations and halide complexation
• Analytical chemistry: iodine titrations, redox measurements
• Water treatment: rapid chlorine reduction for pools, spas, and aquatic systems
• Research workflows: catalyst studies, materials processing, thin-film development
Quality & Compliance
-
Produced under controlled conditions for low particulate and low metallic impurity levels
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Meets internal QA/QC standards for semiconductor-adjacent wet chemistry
-
Complies with applicable EU REACH and GHS handling classifications
Packaging & Availability
Supplied in sealed HDPE or polymer-lined containers designed to minimize moisture uptake and preserve material integrity. Standard pack sizes include:
-
10 lb
-
Custom quantities available upon request
Safety Information
GHS Classification:
Not classified as hazardous in solid form; decomposes under strong acids releasing sulfur dioxide.
Hazard Statements:
-
May cause mild skin or eye irritation
-
Avoid inhalation of dust; use proper ventilation
Proper PPE (gloves, eye protection, dust mask for powders) is recommended during handling.
Ordering Information
| Catalog No. | Product Description | Pack Size |
|---|---|---|
| STS-P99-10 | Sodium Thiosulfate, ≥99% | 10 lb |
| STS-P99-CUST | Sodium Thiosulfate, ≥99% | Custom |