Applications:

1. Used as bleaching agent, mordant, reducing agent, rubber coagulant, also used in organic synthesis, pharmaceutical and perfume, etc. 

2. Used as chromatographic reagents, preservatives and reducing agents in the dye and pharmaceutical industries.

3. Sodium metabisulfite has a stronger reducing property than sulfate, and its effect is similar to that of sodium sulfite. 

4. The pharmaceutical industry is used in the production of chloroform, phenylpropyl sulfone and benzaldehyde. The rubber industry is used as a coagulant. In the printing and dyeing industry, it is used as a dechlorination agent for cotton cloth after bleaching, and as a cotton scouring aid. The tanning industry is used for leather processing, which can make the leather soft, plump and tough, and has the properties of waterproof, folding resistance and wear resistance. The chemical industry is used to produce hydroxyvanillin, hydroxylamine hydrochloride, etc. The photosensitive industry is used as developer and so on. 

5.For analysis. Preservatives. reducing agent. Antioxidant

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