1, Chemical name: Sodium thiosulfate
2, Structural formula:
3, Molecular formula: Na2S2O3·5H2O
4, Molecular weight: 248.17
5, Properties: monoclinic crystal, Melting point : 40-45℃, Relative density :1.729(17℃).
6, Quality standard:
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 |
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Granularity(g/g) |
12~16 |
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7, Packing:25kg, 50kg plastic woven bag, or following your demand g.
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 |
