SZSE：002741
Chemical Reagents
Sodium pyrosulfiteCOA Report
  • CAS No.：7681-57-4
  • Molecular weight：190.09
  • Molecular formula：Na2S2O5
  • EC No.：231-673-0
  • HS-No：28321000
Information
Specification category：
Product No. Product name specifications
1.01596.010 Sodium pyrosulfite AR500g
1.01596.020 Sodium pyrosulfite CP500g
1.01596.030 Sodium pyrosulfite CP25kg/drum
1.01596.040 Sodium pyrosulfite AR25kg/drum
1.01596.060 Sodium pyrosulfite CP10kg/drum
Characteristic： Appearance and properties: white crystal or crystal powder,sulfurous acid odor slightly.
Relative density?(water=1): 1.48
Melting point(℃): >300(resolve)
Concentration: sterling
Solubility: soluble in water. Soluble in ethanol, acetone etc.
Technical indicators：
Item AR CP
Assay(Na2S2O5) ≥96.0% ≥94.0%
Clarity of solution pass3 pass5
Insoluble matter in water ≤0.005% ≤0.01%
Chloride(Cl) ≤0.005% ≤0.02%
Thiosulfate (S2O3) ≤0.05% --
Arsenic(As) ≤0.0001% ≤0.0002%
Iron(Fe) ≤0.0005% ≤0.002%
Heavy metals(as Pb) ≤0.0005% ≤0.002%
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