Sodium Metabisulfite
CAS: 7681-57-4
Other Chemicals
Sodium Hydrosulphite
CAS Number
7775-14-6
Molecular Formula
Na₂S₂O₄
HS Code
2831100000
EINECS Number
231-890-0
UN Number
1384
Hazard Class
4.2
Appearance
White crystalline powder
Properties
White crystalline powder with sulfur dioxide odor. Strong reducing agent. Easily oxidized in moist air, should be stored sealed. Soluble in water, slightly soluble in ethanol.
Sodium hydrosulphite, also known as sodium dithionite (Na₂S₂O₄), a powerful reducing agent used in textile and paper industries for bleaching and dyeing processes. Available in multiple grades: 74%, 85%, 88%, 90%.
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Specifications
Grades: 74% / 85% / 88% / 90%
Appearance: White crystalline powder
Packaging: 50kg/Drum
Appearance: White crystalline powder
Packaging: 50kg/Drum
Applications
• Dyeing aid for cotton fabrics
• Bleaching agent for cotton and wool fabrics
• Medicine and mineral processing
• Copper plate printing
• Synthesis of thiourea and other sulfides
• Paper industry bleach
• Food-grade: bleach, preservative and antioxidant
• Bleaching agent for cotton and wool fabrics
• Medicine and mineral processing
• Copper plate printing
• Synthesis of thiourea and other sulfides
• Paper industry bleach
• Food-grade: bleach, preservative and antioxidant
Quality Standards
| Item | 74% | 85% | 88% | 90% |
|---|---|---|---|---|
| Hydrosulphite Content | 74% | 85% | 88% | 90% |
| Water Insoluble, max | 0.3% | 0.3% | 0.1% | 0.1% |
| Sodium Thiosulfate (Na₂S₂O₃), max | 1.4% | 1.5% | 1.3% | 1.0% |
| Sodium Metabisulfite (Na₂S₂O₅) | 5-7% | 5-7% | 5-7% | 5-7% |
| Sodium Bisulfite (NaHSO₃), max | 0.5% | 0.5% | 0.5% | 0.5% |
| Sodium Carbonate (Na₂CO₃), max | 0.6-2% | 0.6-2% | 0.6-2% | 0.6-2% |
| Sodium Formate (HCOONa), max | 0.5% | 0.8% | 0.5% | 0.5% |
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