Sodium metabisulfite is a white or yellow crystalline powder or small crystal with a strong SO2 odor, a specific gravity of 1.4, soluble in water, and the aqueous solution is acidic. When it is in contact with a strong acid, it releases SO2 to form a corresponding salt. When it is left in the air, it oxidizes. It is Na2S2O6, so the product cannot be stored for a long time. Above 150 degrees Celsius, SO2 is decomposed.
Product Informations:
| CAS No. | 7681-57-4 |
| EINECE | 231-673-0 |
| HS CODE | 2832100000 |
| MOLECULAR FORMULA | Na2S2O5 |
Specifications:
1) Food Grade
| Items | Specifications | Typical Analysis |
| Colour | / | White or yellowish | White |
| State | / | Crystalline powder | Crystalline powder |
| Na2S2O5 | (%) | 96.5 Min. | 97.1 |
| Fe | (%) | 0.003 Max | 0.0021 |
| Clarity | / | Passed | Passed |
| As | (ppm) | 1.0 Max | 0.85 |
| Heavy Metal(as Pb) | (ppm) | 5.0 Max | 0.04 |
2) Industrail Grade
| Items | Specifications | Typical Analysis |
| Na2S2O5 | (%) | 96.5 Min. | 96.83 |
| Fe | (%) | 0.003 Max | 0.0006 |
| As | (ppm) | 1.0 Max | 0.8 |
| Heavy Metal(as Pb) | (ppm) | 5.0 Max | 2.0 |
Remarks:
1. Packing: plastic woven bag with PE liner.
2. Utilizes China National Standard GB1893-2008.
Packing :
25kg /50kg /1000kg plastic woven bag, or as per customer demanding.
Uses:
1.Used for the production of insurance powder, sulfadimethylpyrimidine, analgin, caprolactam and so on;
2.Used for the purification of chloroform, phenylsulfoxide and benzaldehyde.
3.Ingredients used as fixing agents in the photographic industry;
4.The spice industry is used to produce vanillin;
5.Used as a preservative in brewing industry;
6.Rubber coagulant and cotton cloth after bleaching dechlorination agent;
7.Used for printing and dyeing, tanning;
