Description

Ammonium Metabisulfite is an inorganic salt widely recognized for its potent reducing and antioxidant properties. This compound is essential for processes requiring oxygen scavenging, microbial control, and the preservation of material integrity. It serves as a critical processing aid and preservative across diverse industrial sectors, including water treatment, food & beverage production, and photographic development.

Application

• Water Treatment: Acts as a powerful oxygen scavenger and biocide in boiler feed water and industrial cooling systems to prevent corrosion and scaling.
• Food & Beverage Industry: Used as a preservative (E223) and antioxidant in wines, beers, fruit juices, and dried fruits to inhibit spoilage and maintain color.
• Photographic Chemistry: Serves as a fixing agent and preservative in photographic developing solutions.
• Textile & Leather Processing: Employed as a bleaching agent and reducing agent in dyeing and printing processes.
• Pulp & Paper Industry: Functions as a bleaching chemical and an antichlor agent to remove excess chlorine after pulp bleaching.
• Chemical Synthesis: Utilized as a reducing agent and sulfonating agent in various organic synthesis reactions.
• Gold Mining: Applied in the extraction process to precipitate gold from leach solutions.

Basic Information

Product Name	Ammonium Metabisulfite
CAS No.	32736-64-4
Molecular Formula	(NH₄)₂S₂O₅
Molecular Weight	228.20 g/mol
Synonyms	Ammonium Pyrosulfite; Diammonium Disulfite; Ammonium Disulfite; E223; (NH4)2S2O5; Ammonium Metabisulphite; Ammonium Acid Sulfite
EINECS	251-219-3

Quality Control

Our Ammonium Metabisulfite is manufactured under a stringent quality management system. We offer grades suitable for industrial, technical, and food applications, with production processes designed to meet relevant purity and safety standards. A comprehensive Certificate of Analysis (COA), detailing assay, impurity profiles, and physical specifications, is provided with each shipment to ensure batch-to-batch consistency and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area away from heat and moisture sources. Due to its hygroscopic nature, the container must be kept tightly sealed after each use to prevent caking and decomposition. Incompatible with strong acids and strong oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder or granules
Identification (IR)	Conforms
Assay (as (NH₄)₂S₂O₅)	≥ 96.0 %
Water Insolubles	≤ 0.05 %
Iron (Fe)	≤ 10 ppm
Heavy Metals (as Pb)	≤ 10 ppm
pH (5% solution)	4.0 - 5.0

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