| Classification: | Sulphate |
|---|---|
| Brand Name: | Sodium Pyrosulfite |
| Appearance: | white or yellowish crystalline powder |
| Purity: | 98% |
| Grade Standard: | Industrial Grade |
| CAS No.: | 7681-57-4 |
| Type: | Sodium Metabisulfite |
Quick Details
Specifications
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 so2 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.
