1. Chemcial name:Sodium thiosulfate
2. Structural formula:
3. Molecular formula: Na2S2O3·5H2O
4. Molecular weight: 248.17
5. Physical and chemical properties: monoclinic crystal, melting point: 40-45℃, relative density: 1.729(17℃).
6. Quality index:
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Item
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Photographic grade
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Technical grade
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Anhydrous grade
|
|
Appearance
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colorless transparent crystal
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colorless transparent crystal
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white powder
|
|
Content
|
≥99.00%
|
≥98.5%
|
≥97.0%
|
|
Water insoluble matter
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≤0.01%
|
≤0.03%
|
≤0.03%
|
|
Sulfide
|
≤0.001%
|
≤0.003%
|
≤0.001%
|
|
Iron
|
≤0.001%
|
≤0.003%
|
≤0.005%
|
|
PH value
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6.5~9.5
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6.5~9.5
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6.5~9.5
|
|
Aqueous reaction
|
pass test
|
pass test
|
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Particle size
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12~16
|
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7. Packing: 25kg, 50kg plastic woven bag, or at customer's request.
8. Uses: in fixing agent, electroplating, leather, reducing agent, dechlorinating agent, fading agent, and other industries.
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