Sodium Hydrosulphite
CAS: 7775-14-6
Other Chemicals
Sodium Metabisulfite
CAS Number
7681-57-4
Molecular Formula
Na₂S₂O₅
HS Code
2832100000
EINECS Number
231-673-0
UN Number
2693
Hazard Class
9
Appearance
White crystalline powder
Properties
White crystalline powder or granules with strong sulfur dioxide odor. Reducing agent. Soluble in water, slightly soluble in ethanol. pH 4.0-4.8.
Sodium metabisulfite (Na₂S₂O₅), available in food grade and industrial grade. Food grade meets FCC V and E 223 quality standards. Used as bleaching agent, preservative, and antioxidant.
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Specifications
Food Grade: ≥98.0% purity, meets FCC V and E 223 standards
Industrial Grade: ≥96.0% purity
SO₂ Content: ≥65.0%
Packaging: 25kg bags (plastic woven, kraft paper, polyethylene), 500-1200kg bulk bags
Industrial Grade: ≥96.0% purity
SO₂ Content: ≥65.0%
Packaging: 25kg bags (plastic woven, kraft paper, polyethylene), 500-1200kg bulk bags
Applications
Food Grade:
• Bleach (candy, cakes, magnolia chips, etc.)
• Loosening agent (bread, biscuits, etc.)
• Antiseptic and fungicide (juice, canned food, brewing, food storage)
• Anti-oxygen preservatives (golden needle buds, seafood, fruits and vegetables)
Industrial Grade:
• Printing and dyeing mordant
• Dechlorination agent after fabric bleaching
• Chemical and pharmaceutical reducing agents and sulfonating agents
• Bamboo, wood and paper fiber bleach
• Non-ferrous metal dressing agent
• Waste water treatment agent
• Rubber coagulant
• Aromatic industry
• Bleach (candy, cakes, magnolia chips, etc.)
• Loosening agent (bread, biscuits, etc.)
• Antiseptic and fungicide (juice, canned food, brewing, food storage)
• Anti-oxygen preservatives (golden needle buds, seafood, fruits and vegetables)
Industrial Grade:
• Printing and dyeing mordant
• Dechlorination agent after fabric bleaching
• Chemical and pharmaceutical reducing agents and sulfonating agents
• Bamboo, wood and paper fiber bleach
• Non-ferrous metal dressing agent
• Waste water treatment agent
• Rubber coagulant
• Aromatic industry
Quality Standards
| Item | Food Grade | Industrial Grade |
|---|---|---|
| Purity (as Na₂S₂O₅), %, ≥ | 98.0 | 96.0 |
| Sulfur Dioxide (SO₂), %, ≥ | 65.0 | 65.0 |
| Arsenic (As), %, ≤ | 0.0002 | -- |
| Heavy Metals (as Pb), %, ≤ | 0.0005 | -- |
| Selenium (Se), %, ≤ | 0.0005 | -- |
| Iron (Fe), %, ≤ | 0.001 | 0.002 |
| Water Insoluble, %, ≤ | 0.02 | 0.05 |
| pH Value | 4.0-4.8 | 4.0-4.8 |
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