Sodium Pyrosulfite

Min. Order: 10 Tons
Payment Terms: L/C, T/T
Sodium Pyrosulfite

Product Description

CAS No.: 7681-57-4
MF: Na2S2O5
EINECS No.: 231-673-0

Property: White or light yellow crystal powder, a strong smell of sulfur dioxide, relative density is 1.4, easy to dissolve in water and glycerin, water solution. It has acidity, and its solubility will become large while raising the temperature and is less to dissolve in ethanol

Appearance: White Free Flowing Fine Crystal or Powder
Packing: Packed in 25kg plastic woven bag
ItemQuality Index
Food GradeIndustry Grade
Purity ( As Na2S2O5)98.0% min96.0% min
Sulfur Dioxide( SO2)65.0% min65.0% min
Arsenic ( As )0.0002% max-
Heavy metals ( As Pb )0.0005% max-
Selenium (Se )0.0005% max-
Iron (Fe)0.001% max0.002% max
Water insoluble0.02% max0.05% max
PH value :4.0-4.84.0-4.8
Remark :Conformed with FCC V and E 223 Standard
Specification for Pharmaceutical Grade and Photo Grade   
ItemQuality Index
Pharmaceutical GradePhoto Grade
Purity ( As Na2S2O5)98.0% min98.0% min
Sulfur Dioxide( SO2)65.0% min65.0% min
Thiosulphate ( As S2O3) :0.05 % max0.05% max
Chloride ( As CL - ) :30 ppm max50ppm max
Arsenic ( As ) :1ppm max1ppm max
Lead ( Pb ) :1 ppm max2ppm max
Copper (Cu) :1 ppm max1ppm max
Iron (Fe ) :5 ppm max5ppm max
Mercury (Hg) :0.1ppm max1ppm max
Chromium (Cr) :1 ppm max-
Selenium (Se ) :1 ppm max5ppm max
Zinc (Zn)1 ppm max1ppm max
Cadmium (Cd )1ppm max-
Nickel (Ni)1ppm max-
Na2SO3 + Na2SO41.5% max-
PH value :4.0-4.84.0-4.8
Remark :Conformed with USP standard

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Last Login Date: May 19, 2014

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