Sodium Metabisulfite

Product Overview

Sodium Metabisulfite is a white crystalline powder widely used as a preservative, antioxidant, disinfectant, and reducing agent. It is commonly applied in food & beverage processing, water treatment, pharmaceuticals, textiles, mining, and pulp & paper industries.

Due to its strong reducing properties and sulfur dioxide (SO₂) release in aqueous solutions, sodium metabisulfite is an essential chemical for oxidation control, microbial inhibition, and dechlorination.

Key Product Identification

• Product Name: Sodium Metabisulfite

• Chemical Formula: Na₂S₂O₅

• CAS Number: 7681-57-4

• Molecular Weight: 190.10 g/mol

• HS Code: 28321000

• Appearance: White or slightly yellow crystalline powder

• Odor: Slight sulfur dioxide odor

• Solubility: Soluble in water, insoluble in ethanol

Chemical & Physical Properties

Manufacturing & Quality Control

Sodium Metabisulfite is manufactured through controlled absorption of sulfur dioxide into sodium carbonate or sodium hydroxide solutions, followed by crystallization and drying.

Quality control includes:

• Assay and SO₂ content analysis

• Moisture and impurity testing

• Batch traceability and consistency verification

Available grades:

• Food Grade (E223)

• Industrial Grade

• Pharmaceutical Grade

Applications of Sodium Metabisulfite

Food & Beverage Industry

• Preservative and antioxidant (E223)

• Prevents enzymatic browning in fruits and vegetables

• Used in wine, beer, juice, and dried food processing

Water Treatment

• Dechlorination agent

• Removal of residual chlorine and chloramine

• Oxygen scavenger in industrial water systems

Pharmaceuticals

• Antioxidant and stabilizer in formulations

• Intermediate in API manufacturing

Mining & Mineral Processing

• Depressant in flotation processes

• Gold and copper ore processing

Textile & Paper Industry

• Bleaching agent and reducing agent

• Color fixation and pulp processing

Packaging & Storage

• Packaging Options:

• 25 kg woven bag with PE liner

• 1,000 kg jumbo bag (FIBC)

• Customized packaging available

• Storage Conditions:

• Store in cool, dry, and well-ventilated areas

• Protect from moisture, heat, and direct sunlight

• Avoid contact with acids (releases SO₂ gas)

• Shelf Life: 12 months under proper storage conditions

Safety & Handling

• Releases sulfur dioxide upon contact with acids or moisture

• Avoid inhalation of dust

• Use protective gloves, masks, and eye protection

• Refer to SDS/MSDS for detailed safety instructions

Regulatory & Compliance

Documentation available upon request:

• COA (Certificate of Analysis)

• SDS / MSDS

• Food-grade compliance (E223)

• REACH, ISO, and export documentation

Why Choose Our Sodium Metabisulfite?

• ✔ High SO₂ content and stable quality

• ✔ Available in food, pharma, and industrial grades

• ✔ Strict quality control and batch consistency

• ✔ Competitive pricing and reliable global supply

• ✔ Professional technical and regulatory support

Frequently Asked Questions (FAQ)

Q1: What is Sodium Metabisulfite used for?

It is used as a preservative, antioxidant, reducing agent, and dechlorination chemical across multiple industries.

Q2: Is Sodium Metabisulfite food safe?

Food-grade sodium metabisulfite (E223) is approved for use within regulated limits.

Q3: Does it release sulfur dioxide?

Yes, it releases SO₂ when dissolved in water or exposed to acids.

Q4: How should it be stored?

Store in airtight containers in dry, cool conditions to prevent decomposition.