Description

Calcium Bisulfite is an inorganic chemical compound primarily used as a powerful reducing agent and preservative. Its commercial significance lies in its ability to control oxidation and microbial growth, ensuring product stability and process efficiency across several key industries. This makes it a critical material for manufacturers in sectors such as food & beverage, water treatment, and pulp & paper processing. We supply high-purity Calcium Bisulfite CAS NO 13780-03-5 to meet the stringent demands of global industrial applications.

Application

• Food & Beverage Preservation: Acts as an antimicrobial agent and antioxidant to prevent spoilage and discoloration in fruit juices, wines, and canned products.
• Pulp & Paper Bleaching: Used in chemical pulping processes as a bleaching agent and to remove lignin, improving pulp brightness and quality.
• Water & Wastewater Treatment: Effective for dechlorination, removing excess chlorine and chloramines from treated water, and as an oxygen scavenger in boiler feed water systems.
• Textile Processing: Serves as a reducing agent in dyeing and printing processes, helping to fix colors and remove excess dyes.
• Chemical Synthesis: Employed as a sulfonating and reducing agent in various organic synthesis reactions within the pharmaceutical and specialty chemical industries.
• Leather Tanning: Assists in the deliming process, helping to prepare hides for further treatment by adjusting pH and removing impurities.

Basic Information

Product Name	Calcium Bisulfite
CAS No.	13780-03-5
Molecular Formula	Ca(HSO3)2
Molecular Weight	202.22 g/mol
Synonyms	Calcium hydrogen sulfite; Sulfurous acid, calcium salt (1:?); Calcium bisulphite; Calcium disulfite; Calcium acid sulfite; EINECS 237-423-7; Calcium hydrogensulfite
EINECS	237-423-7

Quality Control

Our Calcium Bisulfite is manufactured under strict quality management protocols. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, composition, and performance. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, impurity profiles, and physical properties. Our quality systems are designed to support compliance with relevant industrial and food-grade standards, ensuring reliability for your critical processes.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture. For long-term stability, consider storing under an inert atmosphere to minimize oxidation.

Specification

Item	Specification
Appearance	White to yellowish liquid or crystalline mass
Identification (IR)	Conforms
Assay (as Ca(HSO3)2)	Min. 30.0% - 40.0% (Solution) / Contact for details (Solid)
pH (of solution)	3.0 - 5.0
Sulfur Dioxide (SO2) Content	Contact for details
Heavy Metals (as Pb)	Max. 10 ppm
Iron (Fe)	Max. 5 ppm

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