Description

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1. Product Overview

Sodium Metabisulfite — CAS 7681-57-4 is a high-performance inorganic reducing agent widely used across water treatment, food processing, mining, textile, pulp and paper, and chemical manufacturing industries. It serves primarily as an oxygen scavenger, bleaching agent, preservative, and dechlorination chemical, delivering reliable process efficiency and consistent performance. Its strong reducing properties, cost-effectiveness, and broad industrial compatibility make it a preferred solution for demanding applications. As global industries increasingly prioritize water quality, process optimization, and product preservation, Sodium Metabisulfite remains a strategically important commodity in international markets.

2. Key Specifications & Technical Characteristics

• Chemical Name: Sodium Metabisulfite
• CAS Number: 7681-57-4
• Molecular Formula: Na₂S₂O₅
• Molecular Weight: 190.10 g/mol
• Chemical Composition: Sodium pyrosulfite compound containing sulfur dioxide equivalents
• Purity Level: ≥97%–99%
• Grade Availability: Industrial Grade, Food Grade, Water Treatment Grade
• Appearance: White to slightly yellow crystalline powder
• Odor: Characteristic sulfur dioxide odor
• Solubility: Easily soluble in water
• Bulk Density: Approximately 1.2–1.5 g/cm³
• Packaging Options:
  • 25 kg woven bags with PE liner
  • 50 kg bags
  • 500 kg jumbo bags
  • 1 MT bulk bags
• Shelf Life: Up to 24 months when stored in a cool, dry, and well-ventilated environment away from moisture and oxidizing agents

3. Core Industrial Applications

Sodium Metabisulfite is extensively utilized across numerous industrial sectors:

• Water Treatment Industry
  • Removal of residual chlorine and oxygen scavenging in municipal and industrial water systems.
  • Protection of reverse osmosis membranes and process equipment.
• Mining Industry
  • Flotation processes and cyanide detoxification.
  • Precious metal extraction operations.
• Food and Beverage Industry
  • Preservation of dried fruits, wines, juices, and starch products.
  • Prevention of oxidation and microbial spoilage.
• Textile Industry
  • Bleaching and dye reduction processes.
  • Improvement of color uniformity and fabric quality.
• Pulp and Paper Industry
  • Delignification and bleaching operations.
  • Enhancement of pulp brightness and process efficiency.
• Chemical Manufacturing
  • Intermediate and reducing agent for numerous chemical synthesis applications.

Compared with alternative reducing agents, Sodium Metabisulfite offers superior cost efficiency, excellent solubility, rapid reaction kinetics, and dependable operational performance, helping manufacturers reduce processing costs while maintaining product quality.

4. Competitive Advantages

• Consistent high purity and stringent quality control standards.
• Stable and reliable global supply capability for long-term procurement requirements.
• Efficient logistics network supporting containerized and bulk shipments worldwide.
• Competitive pricing for large-volume industrial buyers.
• Environmentally responsible application in dechlorination and water treatment processes.
• Available technical documentation including COA, MSDS, TDS, and quality certificates.
• Flexible packaging solutions tailored to customer requirements.
• Responsive technical support and export documentation services.
• A strategic sourcing option for industries seeking dependable performance and supply security.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): BULK 20 MT
• Loading Capacity:
  • 20-ft Container: Approximately 25–27 MT
  • 40-ft Container: Approximately 50–54 MT (subject to packaging configuration)