Product: 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
|
|
