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Sodium metabisulfite

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Sodium metabisulfite

Sodium metabisulfite (Na2S2O5) is an inorganic compound, white or yellow crystal, with a strong pungent odor, soluble in water, the aqueous solution is acidic, and when contacted with a strong acid, it releases sulfur dioxide and generates corresponding salts. If it is placed in the air for a long time, it will be oxidized to sodium sulfate, so sodium metabisulfite cannot be stored for a long time.

Chemical formula: Na2S2O5

Molecular weight: 190.09

CAS Number: 7681-57-4

EINECS Accession Number: 231-673-0

Melting point: 150 ℃ (decomposition)

Water solubility: soluble in water, the aqueous solution is acidic, soluble in glycerol, slightly soluble in ethanol

Appearance: white crystalline powder with the smell of sulfur dioxide


For the production of hydrosulfites, sulfamethazine, analgin, caprolactam, etc.; for the purification of chloroform, phenylpropyl sulfone and benzaldehyde. It is used as a fixing agent in the photographic industry; used in the perfume industry to produce vanillin; used as a preservative in the brewing industry; a rubber coagulant and a dechlorination agent after bleaching cotton; ; Used as electroplating industry, waste water treatment in oil field and as mineral processing agent in mines, etc.; used as preservative, bleaching agent and bulking agent in food processing.


It has a significant stimulating effect on the skin and mucous membranes, and can cause symptoms of conjunctiva and bronchitis. Staff should take precautions. Store in a cool, dry, well-ventilated warehouse. Keep away from fire and heat sources. Keep container tightly closed. It should be stored separately from oxidants, acids, and edible chemicals, and should not be stored together.