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CAS No:7681-57-4 Sodium metabisulfite
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industrial grade sodium pyrosulfite

  • CAS No.: 7681-57-4
  • Purity: 95%-98%
  • Min quantity: 10 Metric Tons
  • Price: USD 220~360/Metric Tons
  • Place of Orign: Xinxiang ,Henan,China
Ms.Betty Gao

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Item specifics

  • Product Name.:industrial grade sodium pyrosulfite
  • CAS No: 7681-57-4
  • Weight: 190.106539
  • Formula: Na2O5S2
  • Melting Point: 150 ºC
  • Density: 1.48

Details

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.

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