Description

Potassium Sulfite, Dihydrate is a white, crystalline inorganic salt widely used as a versatile reducing agent and preservative. Its primary commercial value lies in its ability to prevent oxidation and inhibit microbial growth, thereby extending the shelf life and stability of various products. This compound is essential for manufacturers in the food and beverage, pharmaceutical, and water treatment industries seeking reliable and compliant chemical solutions.

Application

• Food & Beverage Industry: Used as a preservative (E225) and antioxidant in wines, beers, fruit juices, and dried fruits to prevent spoilage and browning.
• Pharmaceutical Manufacturing: Serves as an antioxidant in certain drug formulations and intravenous solutions to maintain product potency and stability.
• Water Treatment: Acts as an oxygen scavenger in boiler feed water and closed heating systems to prevent corrosion.
• Photographic Industry: Employed as a developing agent in photographic solutions.
• Chemical Synthesis: Functions as a reducing agent and sulfonating agent in various organic synthesis processes.
• Textile Processing: Used in bleaching and dechlorination stages of fabric treatment.
• Pulp & Paper Industry: Applied in chemical pulping and as a bleaching agent for paper products.

Basic Information

Product Name	Potassium Sulfite, Dihydrate
CAS No.	7790-56-9
Molecular Formula	K2SO3·2H2O
Molecular Weight	194.29 g/mol
Synonyms	Potassium sulphite dihydrate; Dipotassium sulfite dihydrate; Sulfurous acid, dipotassium salt, dihydrate; E225; Kaliumsulfit Dihydrat; Potassium Sulfite (K2SO3) Dihydrate; K2SO3.2H2O
EINECS	232-271-5

Quality Control

Our Potassium Sulfite, Dihydrate is produced under strict quality management systems. We offer grades suitable for food, pharmaceutical, and technical applications, with testing protocols aligned to relevant standards such as FCC, USP, or in-house specifications. Every batch is accompanied by a comprehensive Certificate of Analysis (COA) to ensure traceability and compliance with your specific requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and easily oxidized; containers must be kept tightly sealed to exclude moisture and air. Store away from strong acids and oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (K2SO3·2H2O)	≥ 98.0 %
pH (5% solution)	8.0 - 10.0
Heavy Metals (as Pb)	≤ 10 ppm
Iron (Fe)	≤ 20 ppm
Water Insoluble Matter	≤ 0.1 %

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