Description

Sodium Bisulfite is an essential inorganic compound widely used as a versatile reducing agent and preservative. Its ability to scavenge oxygen and inhibit oxidation makes it a critical component for ensuring product stability and process efficiency across numerous industries. Key industrial buyers in water treatment, food processing, pulp & paper manufacturing, and textile production rely on its consistent quality and reliable performance.

Application

• Water Treatment: Primary application as a dechlorinating agent and oxygen scavenger in municipal and industrial wastewater systems to protect downstream equipment.
• Food & Beverage Industry: Used as a preservative (E222) to prevent discoloration and spoilage in wines, dried fruits, and vegetable processing.
• Pulp & Paper Manufacturing: Employed in chemical pulping (sulfite process) and as a bleaching agent to brighten paper pulp.
• Textile Processing: Serves as an antichlor to remove excess bleach after fabric whitening and as a reducing agent in dyeing processes.
• Chemical Synthesis: Acts as a reducing agent and sulfonating agent in various organic synthesis reactions and pharmaceutical intermediates.
• Photography: Utilized in photographic developing solutions as a fixing agent.
• Leather Tanning: Assists in the deliming process during leather production.
• Oil & Gas Industry: Applied as an oxygen scavenger in secondary oil recovery and to treat drilling fluids.

Basic Information

Product Name	Sodium Bisulfite
CAS No.	7631-90-5
Molecular Formula	NaHSO₃
Molecular Weight	104.06 g/mol
Synonyms	Sodium hydrogen sulfite; Sodium sulfoxylate; Sulfurous acid, monosodium salt; Sodium acid sulfite; Bisulfite de sodium; E222; Leucogen
EINECS	231-548-0

Quality Control

Our Sodium Bisulfite is manufactured under a stringent quality management system to ensure batch-to-batch consistency and reliability. Product quality is verified against relevant industry specifications, including Food Chemical Codex (FCC) and technical grades. A comprehensive Certificate of Analysis (COA), detailing assay, purity, and impurity profiles, is provided with every shipment to guarantee compliance with your specific requirements.

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 product is hygroscopic (moisture-sensitive) and easily oxidized; containers must be kept tightly sealed to minimize exposure to air and moisture to prevent caking and maintain efficacy.

Specification

Item	Specification
Appearance	White crystalline powder or solution
Identification (IR)	Conforms
Assay (as NaHSO₃)	≥ 98.0 %
pH (1% Solution)	4.0 - 5.5
Iron (Fe)	≤ 10 ppm
Heavy Metals (as Pb)	≤ 5 ppm
Water Insolubles	≤ 0.05 %
Thiosulfate (as S₂O₃)	≤ 0.1 %

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