Description

Potassium Sulfite is an inorganic salt widely recognized for its potent reducing and antioxidant properties. This compound is essential for processes requiring the prevention of oxidation and the removal of dissolved oxygen. It serves as a critical raw material and processing aid across diverse industrial sectors, including food preservation, water treatment, and photographic development. Its reliable performance makes it a key component for manufacturers seeking to enhance product stability and shelf life.

Application

• Food & Beverage Industry: Used as a preservative (E225) and antioxidant in wines, beers, fruit juices, and dried fruits to prevent spoilage and browning.
• Water Treatment: Acts as an oxygen scavenger in boiler feed water and closed heating/cooling systems to prevent corrosion.
• Photographic Chemistry: Serves as a developing agent and preservative in photographic fixing baths.
• Textile Manufacturing: Employed as a reducing agent and antichlor in bleaching and dyeing processes.
• Chemical Synthesis: Functions as a sulfonating agent and intermediate in the production of various chemicals and pharmaceuticals.
• Pulp & Paper Industry: Used in chemical pulping processes and as a bleaching agent for paper products.

Basic Information

Product Name	Potassium Sulfite
CAS No.	23873-77-0
Molecular Formula	K2SO3
Molecular Weight	158.26 g/mol
Synonyms	Dipotassium sulfite; Sulfurous acid, dipotassium salt; Potassium sulphite; E225; Dipotassium trioxidosulfate; K2SO3
EINECS	245-909-9

Quality Control

Our Potassium Sulfite is manufactured under a stringent quality management system. Each batch is tested to ensure it meets precise specifications for purity, assay, and impurity profiles. We can supply material compliant with relevant standards such as Food Chemical Codex (FCC) for food-grade applications. A detailed Certificate of Analysis (COA) is provided with every shipment to guarantee traceability and consistent quality.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from incompatible materials. Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture and caking. For long-term storage, consider using an inert atmosphere to minimize oxidation.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (as K2SO3)	≥ 95.0 %
pH (5% solution)	8.0 - 10.5
Water Insoluble Matter	≤ 0.1 %
Heavy Metals (as Pb)	≤ 10 ppm
Arsenic (As)	≤ 3 ppm
Loss on Drying	≤ 1.0 %

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