Product Name: Sodium Metabisulfite
Alias: Sodium Pyrosulfite
Category: Inorganic chemical/inorganic salt
CAS NO: 7681-57-4
EC NO:231-673-0
Molecular Formula: Na2S2O5
Molecular Weight: 190.1
Properties: white or yellowish crystalline powder with strong SO
2 odor; specific wt.: 1.4. Soluble in water, its aqueous solution is acidic.
Appearance: White Free Flowing Fine Crystal or Powder
Specification For Food Grade and Industry Grade :
|
Item |
Quality spec. |
|
Food Grade |
Technical Grade |
|
Purity (Na2S2O5) |
≥98.0% |
≥97.0% |
|
Sulfur dioxide( SO2) |
≥65.0% |
65.0% |
|
Arsenic ( As ) |
≤0.0002% |
- |
|
Heavy metal (Pb) |
≤0.0005% |
- |
|
Selenium (Se ) |
≤0.0005% |
- |
|
Iron (Fe) |
≤0.001% |
≤0.002% |
|
Insol. in water |
≤0.02% |
≤0.05% |
|
pH-value : |
4.0-4.8 |
4.0-4.8 |
|
Note: |
Meet 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 |
Packing:25kg plastic woven bag, 25kg Kraft paper bag, 25kg PE bag, 500kg/1000kg/1100kg/1200kg jumbo bag or as per the buyer's requirement.
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.
Storage: Store the product in a dry and cool place.
