sodium pyrosulfite

• Product Namesodium pyrosulfite
  CAS No.7681-57-4
  Purity95%-98%
  Min Quantity10Metric Tons
  Price210~360
• View Contact Detail

• 
  Molecular Structure

Detailed Description

Molecular formula: Na2S2O5
Molecule weight: 190.10
Appearance: White or light yellow crystalline powder
Quality standard: HG/T2826-2008

Company standard
Item Index
Total content(as Na2S2O5)% ≥ 96.5
Main assay(as SO2)% ≥ 65.4
Fe(as Fe)% ≤ 0.004
Water-insoluble % ≤ 0.048
Heavy metals(as Pa)% ≤ 0.0018

National standard

Item Index
Top-grade First grade Qualified product
Total content(as Na2S2O5)% ≥96.0 ≥94.0 ≥92.5
Main assay(as SO2)% ≥65.0 — —
Fe(as Fe)% ≤0.005 ≤0.010 ≤0.015
Water-insoluble % ≤0.05 ≤0.05 ≤0.015
Heavy metals(as Pa)% ≤0.002 — —

Application:
Mordant of printing and dyeing;
Antichlor of textile after bleaching;
Reducing agent of chemical industry and medicine;
Decolorizer of bamboo, wood and paper fiber;
Beneficiation reagent of nonferrous metals;
Coagulator for rubber;
Used as hydrocarbyl spices aldehydes in perfume industry;
Used as hair removal agent, softener and wear resistant agent in leather industry;
Used as eikonogen, reducing agent, protective agent for fixing bath in photographic industry;
Sewage treatment.
Packing: in white PP laminated bag with inner poly bag.
Net weight: 25 kg/bag, 50kg/bag.