Sodium metabisulfite CAS 7681-57-4

Sodium metabisulfite, Promotion Season Now in Store and Free Sample for Testing with Factory Price

Chemical Name: Sodium metabisulfite
CAS No.: 7681-57-4
Molecular Fomula: 2Na.O5S2
Molecular weight: 190.11
Appearance: White to slightly yellow Powder/Solid
Sample: Available

Sodium metabisulfite CAS 7681-57-4

Description of Sodium metabisulfite

Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5. The substance is sometimes referred to as disodium (metabisulfite). It is used as a disinfectant, antioxidant and preservative agent.

Basic Info of Sodium metabisulfite


Chemical Name

Sodium metabisulfite


Fertisilo;Disodium disulfite;Campden Tablets;Natrii disulfis;Natrium pyrosulfit;Expand



Molecular Formula


Molecular Weight






Safety Info



Safety Statements


HS Code


WGK Germany


Packing Group



UN 2693

Risk Statements

R22; R31; R41

Hazard Codes



GHS05, GHS07

Signal Word


Supplemental Hazard Statements

Contact with acids liberates toxic gas.

Caution Statement

P280; P301 + P312 + P330; P305 + P351 + P338 + P310

Hazard Declaration

H302; H318


Appearance & Physical State

white crystalline powder



Melting Point


Water Solubility

540 g/L (20 ºC)


Stable. Incompatible with strong oxidizing agents, strong acids. Contact with strong acids releases a poisonous gas. May be moisture and air sensitive.

Storage Condition

Store at RT.

Appearance & Physical State

white crystalline powder

Numbering system



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What is Sodium metabisulfite?

  With the progress of science and technology and the development of society, chemical products have invariably permeated our daily lives, in medicine, food, cosmetics, electronics, industry, and other areas, becoming an essential part of our lives. One such product is Sodium metabisulfite which has developed particularly rapidly in recent years. Do you know about Sodium metabisulfite?


The official answer:Sodium metabisulphite (Na2S2O5), an inorganic compound, is a white or yellow crystal with a strong irritating odour, soluble in water, the aqueous solution is acidic, and when in contact with strong acids, sulphur dioxide is released and the corresponding salts are produced. If left in the air for a long time, it oxidises to sodium sulphate, so sodium metabisulphite cannot be stored for a long time.

What’s the application of Sodium metabisulfite?

It is used as a preservative, bleaching agent and relaxing agent in food processing. In industry, sodium metabisulphite is used in printing and dyeing, organic synthesis, printing, tanning, pharmaceuticals, etc. Sodium metabisulphite is used in the chemical and pharmaceutical industries for the production of insurance powder, sulfadimethylpyrimethamine, caprolactam, etc. and for the purification of chloroform, benzene propyl sulfone and benzene Chemicalbook formaldehyde. In the photographic industry it is used as an ingredient in fixing agents. Used in the spice industry for the production of vanillin. Used as a preservative in the brewing industry, as a coagulant in rubber and as a dechlorinating agent after bleaching of cotton. Organic intermediates, dyestuffs, tanneries, reducing agents, used in electroplating, waste water treatment in oil fields and as a concentrator in mines, etc.



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