Sodium Pyrosulfite: Industrial-Grade Chemical for Diverse Applications

Sodium Pyrosulfite (Na₂S₂O₅) is a versatile inorganic compound widely used in food preservation, water treatment, and photographic development. With powerful antioxidant and disinfectant properties, it serves as an essential chemical across multiple industries.

Key Product Specifications

• Chemical Formula: Na₂S₂O₅
• CAS Number: 7681-57-4
• Appearance: White crystalline powder
• Purity: ≥96% (Food Grade), ≥93% (Industrial Grade)
• Solubility: 45g/100ml in water at 20°C
• Melting Point: 150°C (decomposes)
• Bulk Density: 1.1-1.3 g/cm³
• pH (1% Solution): 4.0-5.5
• Shelf Life: 24 months in original packaging

Sodium Pyrosulfite Applications

This multifunctional chemical serves critical purposes in:

• Food Industry: Preservative (E223) for dried fruits, wine, and seafood
• Water Treatment: Dechlorination agent and oxygen scavenger
• Photography: Component in developer solutions
• Textile: Bleaching and desulfurizing agent
• Leather: Tanning process chemical
• Mining: Gold extraction processes

Sodium Pyrosulfite FAQ Section

Q: What is the difference between Sodium Pyrosulfite and Sodium Metabisulfite?
A: These are two names for the same chemical compound (Na₂S₂O₅). The terms are used interchangeably in commerce, though "Sodium Metabisulfite" is the IUPAC preferred name while "Sodium Pyrosulfite" remains common in industrial contexts.

Q: How should Sodium Pyrosulfite be stored for maximum shelf life?
A: Store in airtight containers away from moisture at temperatures below 30°C. The product gradually decomposes when exposed to air and humidity. For long-term storage, use sealed plastic-lined bags within fiber drums or polyethylene containers. Keep separate from strong acids and oxidizers.

Q: What safety precautions are necessary when handling Sodium Pyrosulfite?
A: Use appropriate PPE including gloves, goggles, and dust masks. Avoid inhalation of dust and direct skin contact. In case of eye contact, flush immediately with water for 15 minutes. The substance decomposes in water to form sulfur dioxide, so ensure adequate ventilation in working areas. Never mix with strong acids as this produces toxic sulfur dioxide gas.

Detailed Product Parameters

Quality Certifications

• ISO 9001:2015 Certified Production
• Food Grade: FCC, BP, EP Compliant
• REACH Registered
• Kosher and Halal Certificates Available

Sodium Pyrosulfite Handling Guidelines

1. Store in cool, dry, well-ventilated area
2. Keep containers tightly closed when not in use
3. Use appropriate material handling equipment
4. Clean spills immediately with plenty of water
5. Dispose according to local regulations

Additional Sodium Pyrosulfite FAQs

Q: Can Sodium Pyrosulfite be used in organic food production?
A: While Sodium Pyrosulfite is permitted in conventional food processing (with limitations on residual levels), its use in certified organic products depends on specific regulations. In the EU and US, it's generally prohibited in organic food production except for certain wine applications where alternatives are unavailable.

Q: What is the typical lead time for Sodium Pyrosulfite orders?
A: Standard orders ship within 3-5 business days for stock items. Custom packaging or large bulk orders (20+ metric tons) may require 2-3 weeks for production and quality testing. We maintain strategic inventory levels to ensure consistent supply.

Q: How does Sodium Pyrosulfite compare to other sulfites in effectiveness?
A: Sodium Pyrosulfite offers superior solubility and faster reaction kinetics compared to sodium sulfite (Na₂SO₃). It provides approximately 67.4% available SO₂ by weight, making it more efficient than sodium bisulfite (NaHSO₃) for many applications. However, the choice depends on specific process requirements and pH considerations.

Industry-Specific Usage Rates

For precise formulation guidance, our technical team provides application-specific recommendations based on your process parameters and desired outcomes with Sodium Pyrosulfite.