Description

Disulphurous Acid, Sodium Salt is an inorganic chemical compound with significant utility as a versatile reducing agent and intermediate. Its primary commercial value lies in its ability to facilitate controlled reduction reactions in complex chemical synthesis and industrial processes. This product is essential for manufacturers in sectors such as specialty chemicals, pharmaceuticals, and water treatment, where precise redox control is required.

Application

• Chemical Synthesis: Acts as a key reducing agent in the production of specialty organic compounds and fine chemicals.
• Pharmaceutical Intermediates: Used in the synthesis of active pharmaceutical ingredients (APIs) requiring selective reduction steps.
• Water Treatment: Employed in specific dechlorination and oxygen scavenging applications in industrial water systems.
• Textile Processing: Serves as a reducing agent in dyeing and bleaching processes for synthetic and natural fibers.
• Photographic Chemicals: Utilized in the formulation of certain developers and fixers within the photographic industry.
• Laboratory Research: A valuable reagent for academic and industrial R&D in inorganic and analytical chemistry.

Basic Information

Product Name	Disulphurous Acid, Sodium Salt
CAS No.	18403-71-9
Molecular Formula	Na2S2O5
Molecular Weight	190.11 g/mol
Synonyms	Sodium Metabisulfite; Sodium Pyrosulfite; Disodium Disulfite; Disodium Metabisulfite; Sodium Disulfite; Na2S2O5; E224 (when used as a food additive); Anhydrous Sodium Metabisulfite
EINECS	242-262-1

Quality Control

Our Disulphurous Acid, Sodium Salt is manufactured under a strict quality management system to ensure batch-to-batch consistency and reliability. Quality is verified through a comprehensive suite of analytical tests including assay, impurity profiling, and physical characterization. Certificates of Analysis (COA) documenting full compliance with agreed specifications are provided with every shipment and are available upon request.

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 material is hygroscopic (moisture-sensitive); containers must be kept tightly sealed after opening to prevent absorption of atmospheric moisture and caking.

Specification

Item	Specification
Appearance	White crystalline powder or granules
Identification (IR)	Conforms
Assay (as Na2S2O5)	≥ 97.0 %
Iron (Fe)	≤ 10 ppm
Heavy Metals (as Pb)	≤ 10 ppm
Water Insoluble Matter	≤ 0.05 %
pH (10% solution)	4.0 - 5.5

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