Description

Sodium Metabisulfite is a versatile inorganic salt widely recognized for its potent antioxidant and preservative properties. Its primary value lies in its ability to release sulfur dioxide, making it an effective agent for controlling microbial growth, preventing oxidation, and removing excess chlorine. This compound is essential for industries requiring reliable preservation, purification, and chemical synthesis processes. Key sectors that depend on this product include food and beverage processing, water treatment, pharmaceutical manufacturing, and textile production.

Application

• Food & Beverage Preservation: Used as an antioxidant and antimicrobial agent in wines, beers, dried fruits, and fruit juices to prevent spoilage and maintain color.
• Water Treatment: Employed as a dechlorinating agent to neutralize excess chlorine and chloramines in municipal and industrial wastewater.
• Pharmaceutical Manufacturing: Serves as an antioxidant in certain drug formulations and as a sterilizing agent for equipment.
• Textile & Leather Processing: Acts as a bleaching agent, antichlor, and preservative in dyeing and tanning processes.
• Photographic Industry: Used in developing solutions as a reducing agent.
• Chemical Synthesis: Functions as a sulfonating or sulfomethylating agent in the production of various organic chemicals.
• Mining & Metallurgy: Utilized in gold extraction processes (cyanide detoxification) and ore flotation.
• Pulp & Paper Industry: Applied in bleaching sequences and as an antichlor to remove residual bleaching chemicals.

Basic Information

Product Name	Sodium Metabisulfite
CAS No.	7681-57-4
Molecular Formula	Na2S2O5
Molecular Weight	190.11 g/mol
Synonyms	Sodium Pyrosulfite; Disodium Disulfite; Sodium Metabisulphite; Disodium Metabisulfite; Disulfurous Acid, Disodium Salt; E223 (Food Additive Code); SMB
EINECS	231-673-0

Quality Control

Our Sodium Metabisulfite is manufactured under strict quality management systems to ensure batch-to-batch consistency and reliability. We offer various grades, including Food Grade (FCC), Technical Grade, and Photo Grade, each meeting their respective industry specifications. Every batch is tested for critical parameters such as assay, heavy metals, and iron content. A Certificate of Analysis (COA) documenting full compliance is provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from heat and incompatible materials. This product is hygroscopic (moisture-sensitive) and should be kept in original packaging to minimize exposure to atmospheric humidity. Recommended storage temperature is between 15°C and 25°C (59°F and 77°F).

Specification

Item	Specification
Appearance	White or yellowish-white crystalline powder or granules
Identification (IR)	Conforms
Assay (as Na2S2O5)	≥ 97.0 %
Water Insoluble Matter	≤ 0.05 %
Iron (Fe)	≤ 10 ppm
Heavy Metals (as Pb)	≤ 10 ppm
pH (5% Solution)	4.0 - 5.0
Selenium (Se)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.