Sodium Metabisulfite is a versatile chemical widely used across food processing, pharmaceutical manufacturing, and various industrial applications. It appears as a white or slightly yellow crystalline powder with excellent solubility in water and strong reducing properties.
Thanks to its antioxidant and preservative capabilities, Sodium Metabisulfite effectively prevents oxidation, inhibits microbial growth, and maintains product quality during storage and processing.
🔹 Key Features
- High purity and stable quality
- Strong antioxidant and reducing agent
- Excellent solubility in water
- Effective preservation and bleaching performance
- Wide compatibility across industries
🔹 Applications
1. Food Industry
- Used as preservative, antioxidant, and bleaching agent
- Helps maintain color and freshness
- Applied in products such as:
- Fruit wine
- Sugar and glucose
- Bamboo shoots and mushrooms
2. Pharmaceutical Industry
- Used in purification processes of intermediates such as:
- Sulfamethoxazole
- Chloroform derivatives
- Benzaldehyde
3. Textile Industry
- Dechlorination agent for bleached cotton fabrics
- Auxiliary agent in textile processing
4. Leather Industry
- Improves softness and flexibility of leather
- Enhances durability, water resistance, and wear resistance
5. Chemical Industry
- Raw material for:
- Sodium hydrosulfite (insurance powder)
- Hydroxyvanillin
- Hydroxylamine hydrochloride
6. Photography Industry
- Used as a developer component
🔹 Regulatory Information (China GB2760-2014)
- Max dosage in fruit wine: 0.25 g/kg
- Max dosage as bleaching agent: 0.25 g/kg
- Residual SO₂ limits:
- Bamboo shoots & mushrooms: ≤0.025 g/kg
- Other foods: ≤0.1 g/kg
🔹 Storage & Handling
- Store in a cool, dry, and well-ventilated place
- Avoid moisture and direct sunlight
- Keep container tightly closed
- Avoid contact with strong acids
Product Quality:
| National standard(GB1886.7-2015) | |
| Project name | Index |
| Sodium bisulfite (calculated as Na₂S₂O:)w/% ≥ | 96.5 |
| Iron (calculated as Fe)w/% ≤ | 0.003 |
| clarity | Through experimentation |
| Arsenic content (calculated as As)(mg/kg) ≤ | 1.0 |
| Heavy metal content (calculated as Pb)(mg/kg) ≤ | 5.0 |
