Sodium Metabisulfite CAS 7681-57-4

Sodium Metabisulfite CAS NO:7681-57-4 Molecular formula:Na2S2O5 Properties: White or light yellow crystal powder,a strong smell of sulfur dioxide,relative density is 1.4,easy to dissolve in water and glycerin,slightly dissolve in ethanol. Application: Industry...

Product Details

Sodium Metabisulfite

CAS NO: 7681-57-4

Molecular formula: Na2S2O5

Properties:

White or light yellow crystal powder,a strong smell of sulfur dioxide,relative density is 1.4,easy to dissolve in water and glycerin,slightly dissolve in ethanol.

Application:

Industry Grade:Mordant of printing and dyeing;Antichloration of textile after leaching;

Sulphonated agent and reducer of chemical industry and pharmacy;Bleach of paper pulp,bamboo and timber bleach of Stap;Treatment agent of waste water;Rubber solidifying agent Perfume industry is served as hydro carbon perfume aldehyde.Sewage treatment,and so on.

Food Grade:Bleach agent(e.g.candies,cake,bamboo shoots,etc);Loose agent(e.g.bread,cracker etc);Antiseptic and germicide(e.g.fruit juice,tinned food,brews,the cereals food is defended storage etc);Inhibitor and freshen agent(e.g.day lily,seafood,fruit and vegetable etc).

Pharmaceutical Grade:In chemical synthesis in the production of acrylic fiber,vitamin K,vitamin A,pharmaceutical intermediates,etc.

Photo Grade:The sensitize industry is served as the developing agent reductant and the protection of fixing bath dose.

Specification:

Items

Industry grade

Food grade

Content(Na2S2O5)(%)

96.0 min.

98.0 min.

Sulfur Dioxide(SO2)(%)

65.0 min.

65.0 min.

Arsenic(As)(%)

-

0.0002 max.

Heavy metals(as Pb)(%)

-

0.0005 max.

Selenium(Se)(%)

-

0.0005 max.

Iron(Fe)(%)

0.003 max.

0.002 max.

Water insoluble(%)

0.05 max.

0.02 max.

PH value

4.0-4.8

4.0-4.8

 

Items

Pharmaceutical grade

Photo grade

Content(Na2S2O5)(%)

98.0 min.

98.0 min.

Sulfur Dioxide(SO2)(%)

65.0 min.

65.0 min.

Thiosulphate(S2O2)(%)

0.05 max.

0.05 max.

Chloride(Cl)(%)

0.003 max.

0.005 max.

Arsenic(As)(%)

0.0001 max.

0.0001 max.

Lead(Pb)(%)

0.0001 max.

0.0002 max.

Copper(Cu)(%)

0.0001 max.

0.0001 max.

Iron(Fe)(%)

0.0005 max.

0.0005 max.

Mercurg(Hg)(%)

0.00001 max.

0.0001 max.

Chromium(Cr)(%)

0.0001 max.

-

Selenium(Se)(%)

0.0001 max.

0.0005 max.

Zinc(Zn)(%)

0.0001 max.

0.0001 max.

Cadmium(Cd)(%)

0.0001 max.

-

Nickel(Ni)(%)

0.0001 max.

-

Na2SO3+Na2SO4(%)

1.5 max.

-

PH value

4.0-8.0

4.0-8.0

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