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.
Description:
White or light yellow crystal powder, a strong smell of sulfur dioxide,relative density is 1.4, easy to dissolve in water and glycerin, water solution. It has acidity,and its solubility will become large while raising the temperature and is less to dissolve in ethanol.
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;
