Description

Calcium Sulfite, Dihydrate is a white to off-white crystalline powder with the chemical formula CaSO3·2H2O. It serves as a crucial industrial chemical, primarily valued for its role as a reducing agent and preservative across various manufacturing processes. This compound is essential for industries focused on water treatment, food preservation, and chemical synthesis, where its controlled reactivity is leveraged for quality and stability.

Application

• Water Treatment: Acts as an oxygen scavenger and dechlorination agent in boiler feed water and industrial wastewater systems.
• Food Industry: Used as a preservative (E226) and antioxidant to prevent spoilage and maintain color in certain food products and beverages.
• Chemical Manufacturing: Serves as a key intermediate or reducing agent in the synthesis of other sulfur-containing compounds.
• Pulp and Paper: Employed in certain sulfite pulping processes and as a bleaching agent.
• Flue Gas Desulfurization (FGD): Used in some air pollution control systems to remove sulfur oxides from exhaust gases.
• Pharmaceuticals: Finds application as an excipient or in specific chemical synthesis where a mild sulfiting agent is required.
• Agriculture: Utilized in some formulations as a soil amendment or fungicide.
• Photography: Used in certain developing solutions as a preservative.

Basic Information

Product Name	Calcium Sulfite, Dihydrate
CAS No.	10035-03-7
Molecular Formula	CaSO3·2H2O
Molecular Weight	156.17 g/mol
Synonyms	Calcium sulphite dihydrate; Sulfurous acid, calcium salt (1:1), dihydrate; Calcium sulfite (1:1) dihydrate; E226; Preservative E226; CAS 10035-03-7; Calcium sulphite (CaSO3) dihydrate
EINECS	233-596-8

Quality Control

Our Calcium Sulfite, Dihydrate is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, identity, and performance. Certificates of Analysis (COA) are provided with every shipment, documenting compliance with relevant industry standards, including food-grade (FCC) specifications where applicable.

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 property of being easily oxidized, it is recommended to store under an inert atmosphere (e.g., nitrogen) for long-term stability and to minimize contact with air. Keep container tightly sealed when not in use to prevent moisture absorption.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (CaSO3·2H2O)	≥ 95.0 %
Water Insoluble Matter	≤ 0.5 %
Chloride (Cl)	≤ 0.1 %
Heavy Metals (as Pb)	≤ 20 ppm
Selenium (Se)	≤ 30 ppm
Loss on Drying	Contact for details

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