Description

Potassium Metabisulfite is an 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 maintaining product stability. This versatile chemical is essential for industries ranging from food and beverage production to water treatment and pharmaceutical manufacturing. Potassium Metabisulfite CAS NO 16731-55-8 is a critical component for ensuring product quality, shelf life, and safety across these diverse applications.

Application

• Food & Beverage Preservation: Used as a preservative and antioxidant in wines, beers, fruit juices, dried fruits, and vegetable products to inhibit spoilage and browning.
• Water Treatment: Acts as a dechlorinating agent and oxygen scavenger in municipal and industrial water systems to protect equipment from corrosion.
• Pharmaceutical Manufacturing: Serves as an antioxidant in certain drug formulations to enhance stability and extend shelf life.
• Photographic Industry: Employed as a reducing agent in photographic developers and fixers.
• Textile & Leather Processing: Used in bleaching and dechlorination processes for textiles and as an antichlor in leather tanning.
• Chemical Synthesis: Functions as a sulfonating and reducing agent in various organic synthesis reactions.
• Mining & Metallurgy: Applied in ore flotation processes and as a reducing agent in metal recovery operations.

Basic Information

Product Name	Potassium Metabisulfite
CAS No.	16731-55-8
Molecular Formula	K2S2O5
Molecular Weight	222.32 g/mol
Synonyms	Potassium Pyrosulfite; Dipotassium Disulfite; Dipotassium Metabisulfite; Disulfurous Acid, Dipotassium Salt; E224 (Food Additive); K2S2O5; Potassium Disulfite
EINECS	240-795-3

Quality Control

Our Potassium Metabisulfite is manufactured under strict quality management systems. We offer grades compliant with key industry standards, including Food Chemical Codex (FCC) and Technical Grade specifications. Every batch undergoes rigorous analytical testing to ensure consistent purity, potency, and safety. Comprehensive Certificates of Analysis (COA) documenting assay, impurity profiles, and physical parameters are available upon request.

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 easily oxidized; optimal storage conditions are at room temperature (15-25°C) under low humidity. Keep container tightly sealed when not in use to minimize exposure to air and moisture.

Specification

Item	Specification
Appearance	White crystalline powder or granules
Identification (IR)	Conforms
Assay (as K2S2O5)	≥ 95.0 %
SO2 Content	≥ 57.0 %
Water Insoluble Matter	≤ 0.1 %
Iron (Fe)	≤ 10 ppm
Heavy Metals (as Pb)	≤ 10 ppm
pH (5% Solution)	3.5 - 4.5

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