Colorless or slightly yellowish monoclinic crystal compound .
1, Chemical name: Sodium Thiosulfate
2, Structural formula:
3, Molecular formula: Na2S2O2·5H2O
4, Molecular weight: 248.17
5, Properties: monoclinic crystal, Melting point : 40-45, Relative density :1.729(17).
6, Quality standard:
Item | Unit | Photographic grade | Industrial grade | Anhydrous grade |
Appearance |
| colorless transparent crystal | white powder | |
Assay | ≥ % | 99.00 | 98.50 | 97.00 |
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 | ---- | |
Granularity(g/g) |
| 12~16 | --- | ---- |
7, Packing: 25kg, 50kg plastic woven bag, or following your demand.
8, Uses: used in fixers, plating, leather, reductant, dechlorinating agent, sulfur dyeing agent, as a blush preventive agent, and as a disinfectant. and decolor agent
