Sodium Metabisulfite SMBS

Sodium Pyrosulfite

Sodium Metabisulfite is a powerful reducing agent often used in water treatment (dechlorination), food preservation (antioxidant), and bleaching. Its sulfurous properties help safeguard product quality, prevent oxidation, and maintain color stability across diverse industries.

Molecular Formula
Na2S2O5

CAS No
7681-57-4

EC No
231-673-0

Synonyms
Sodium Metabisulphite; SMBS; Disodium Disulfite; Sodium Pyrosulphite; Disodium Pyrosulfite

Sodium Metabisulfite Overview

Sodium Metabisulfite, also called SMBS, is a widely used reducing agent renowned for its ability to neutralize oxidizing agents and preserve the desired qualities of various products. In water treatment, it plays a role in dechlorination to protect equipment and comply with environmental standards. The food and beverage industry often leverages its antioxidant properties to prolong shelf life, maintain flavor, and safeguard color quality.

Key Properties

  • Molecular Formula: Na2S2O5
  • Effective at reducing oxidation
  • Recognizable sulfurous odor

Typical Applications

  • Water Dechlorination: Neutralizing residual chlorine
  • Food & Beverage Preservation: Extending shelf life and preventing oxidation
  • Textile & Paper Processing: Controlling bleaching stages

Owing to its broad utility, SMBS continues to be a staple additive across numerous sectors, helping maintain safety, quality, and efficiency in both industrial and commercial processes.

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