| CAS No.: | 7681-57-4 |
|---|---|
| Formula: | Na2s2o5 |
| EINECS: | 231-673-0 |
|
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Property: white or light yellow crystal powder.
Molecular Formula :Na2S2O5
Molecule Weight :190.12
CAS NO .:7681-57-4
Appearance :White Free Flowing Fine Crystal or Powder
Specification For Food Grade and Industry Grade :
|
Item |
Quality Index
|
|
|
Food Grade
|
Industry Grade
|
|
|
Purity ( As Na2S2O5) |
98.0% min
|
97.0% 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) |
0.001% max
|
0.002% max
|
|
Water insoluble |
0.02% max
|
0.05% max
|
|
PH value : |
4.0-4.8
|
4.0-4.8
|
|
Remark : |
Conformed with FCC V and E 223 Standard
|
|
Specification for Pharmaceutical Grade and Photo Grade
|
Item |
Quality Index |
|
|
Pharmaceutical Grade
|
Photo Grade
|
|
|
Purity ( As Na2S2O5) |
98.0% min
|
98.0% min
|
|
Sulfur Dioxide( SO2) |
65.0% min
|
65.0% min
|
|
Thiosulphate ( As S2O3) : |
0.05 % max
|
0.05% max
|
|
Chloride ( As CL-) : |
30 ppm max
|
50ppm max
|
|
Arsenic ( As ) : |
1ppm max
|
1ppm max
|
|
Lead ( Pb ) : |
1 ppm max
|
2ppm max
|
|
Copper (Cu) : |
1 ppm max
|
1ppm max
|
|
Iron (Fe ) : |
5 ppm max
|
5ppm max
|
|
Mercury (Hg) : |
0.1ppm max
|
1ppm max
|
|
Chromium (Cr) : |
1 ppm max
|
-
|
|
Selenium (Se ) : |
1 ppm max
|
5ppm max
|
|
Zinc (Zn) |
1 ppm max
|
1ppm max
|
|
Cadmium (Cd ) |
1ppm max
|
-
|
|
Nickel (Ni) |
1ppm max
|
-
|
|
Na2SO3 + Na2SO4 |
1.5% max
|
-
|
|
PH value : |
4.0-4.8
|
4.0-4.8
|
|
Remark : |
Conformed with USP standard
|
|
Application:
(1) 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).
(2) Industry Grade: Mordant of printing and dyeing; Dechlorinate of textile after bleaching; 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
The hide profession employ to do to molt dose and pliable dose and wearproof dose; sewage treatment, and so on .
(3) Pharmaceutical Grade: In chemical synthesis in the production of acrylic fibre, vitamin K, vitamin A, pharmaceutical intermediates, etc.
(4) Photo Grade: The sensitize industry is served as the developing agent reductant and the protection of fixing bath dose.
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