Industrial chemicals · Taylor, TXCertificate of Analysis
Sample Certificate of Analysis
Sodium Thiosulfate Technical Grade
Reagent
Sample COA. Contact Alliance Chemical with your lot number to request a lot-specific COA.
- CAS number
- 7772-98-7
- Structure
Structure · PubChem - Grade
- Reagent
- Assay specification
- 99% Minimum
- Answer summary
Sample specification reference for Sodium Thiosulfate Technical Grade. Source-record results are reference values, not measurements for your lot.
Last reviewed 2026-06-17 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
Specifications
| Parameter | Specification | Source reference result | Test Method |
|---|---|---|---|
| Purity | 99% Minimum | 99.6 % | — |
| Appearance / description | Large Translucent Crystals | Passes test | — |
| Arsenic (As) | 0.001% Maximum | 0.00005 % | — |
| Insoluble Matter | 0.01% Maximum | 0.002 % | — |
| Iron (Fe) | 0.002% Maximum | 0.0003 % | — |
| Particle Size | 10 mm – 12 mm | Passes test | — |
| pH of 10% Solution | 6 – 8 | 7 | — |
| Sodium Thiosulfate (Na2S2O3) | 62% to 63.7% | 63.7 % | — |
| Sulfide | Max. 0.001% | 0.00005 % | — |
| Heavy Metals (Pb) | 0.003% Maximum | 0.0002 % | — |
| Sodium Sulfite (Na2SO3) | 0.1% Maximum | 0.03 % | — |
| Chloride (Cl) | 0.1% Maximum | 0.02 % | Turbidimetric vs. chloride standard (AgNO3) / argentometric titration |
| Bulk Density (loose) | 1.05 - 1.25 g/cm3 | 1.15 g/cc | ASTM D1895 Method A / graduated cylinder |
| na2s2o3 | 99 % min | 99.6 % | — |
| sulphide | 0.001 % max | 0.00005 % | — |
| particle particle size | 3 - 6 Mesh | 4.5 | — |
Specification limits and source-record results are reproduced from the current product reference used by the TDS. This sample is not an issued certificate and does not identify a tested lot. Contact Alliance Chemical with the product and lot number for lot-specific documentation.
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