Introduction
Name: Sodium metabisulfite
CAS No：7681-57-4
Molecular Formula: H2O5S2.2Na
Sodium metabisulfite is white or slightly yellow crystalline powder. Soluble in water, aqueous solution is acidic. Soluble in glycerol, slightly soluble in ethanol. Used in food industry as bleaching agent, preservative, loosening agent, antioxidant, color protection agent and preservative.
Specifications
|
Item |
Specifications |
Results | |||
| Na2S205 content w/% | ≥96.5 | 97.07 | |||
| Iron (Fe) w/% | ≤0.003 | 0.0020 | |||
| Clearness | Through the experiment | Qualfied | |||
| Arsenic (As) mg/kg | ≤1.0 | ＜1.0 | |||
| Heavy metals (as Pb) mg/kg | ≤5.0 | ＜5.0 | |||
Packing: 25kg/bag
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Application
1. Sodium metabisulfite is used in the food industry as a bleaching agent, preservative, loosening agent, antioxidant, color protection agent and preservative.
2. Sodium metabisulfite is industrially used in printing and dyeing, organic synthesis, printing, tanning, pharmaceuticals and other departments; used as preservative, bleaching agent and loosening agent in food processing.
Chemical & physical properties
|
Molecular formula |
H2O5S2.2Na |
|
Molecular weight |
192.12 |
|
CAS NO |
7681-57-4 |
|
EINECS NO |
231-673-0 |
|
Density |
1.48 |
|
Appearance |
White to slightly yellow |
|
Melting point |
>300 °C (lit.) |
|
Solubility |
540g/l(20°C) |
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