Description

Potassium Hydrogen Sulfite (CAS NO 7773-03-7) is a versatile inorganic salt widely used as a preservative and reducing agent. Its primary commercial value lies in its ability to inhibit microbial growth and prevent oxidation, thereby extending the shelf life of various products. This makes it an essential chemical for industries such as food and beverage, water treatment, and textile manufacturing, where quality and stability are paramount.

Application

• Food & Beverage Preservation: Used as an antioxidant and antimicrobial agent in wines, beers, fruit juices, and dried fruits to prevent spoilage and browning.
• Water Treatment: Acts as a dechlorinating agent and oxygen scavenger in municipal and industrial water systems to protect pipelines and equipment from corrosion.
• Textile & Leather Processing: Serves as a reducing agent in dyeing and bleaching processes, and in the deliming of hides.
• Photographic Industry: Employed as a component in developing and fixing solutions.
• Chemical Synthesis: Utilized as a reducing agent and sulfur source in various organic and inorganic chemical reactions.
• Pulp & Paper Manufacturing: Helps in the bleaching of pulp and as an antichlor to remove residual chlorine.

Basic Information

Product Name	Potassium Hydrogen Sulfite
CAS No.	7773-03-7
Molecular Formula	KHSO3
Molecular Weight	120.17 g/mol
Synonyms	Potassium Bisulfite; Potassium Acid Sulfite; Sulfurous Acid, Monopotassium Salt; Monopotassium Sulfite; E 228 (Food Additive); Potassium Hydrogen Sulphite
EINECS	231-870-1

Quality Control

Our Potassium Hydrogen Sulfite is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets the required specifications for purity, identity, and performance. Certificates of Analysis (COA) are provided and can be tailored to meet specific customer or regulatory requirements, including those for food-grade (FCC) and technical applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and easily oxidized; it is recommended to store under an inert atmosphere for long-term stability and to minimize exposure to air and moisture.

Specification

Item	Specification
Appearance	White crystalline powder or granules
Identification (IR)	Conforms
Assay (KHSO3)	Min. 95.0%
pH (10% solution)	3.5 - 4.5
Water Insolubles	Max. 0.1%
Heavy Metals (as Pb)	Max. 10 ppm
Iron (Fe)	Max. 10 ppm

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