Sodium Metabisulphite (SMBS)

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Cas No.: 7681-57-4

Einecs No.: 231-673-0

MoleCular Formula: Na2S2O5


Chemical industry

It is used for the production of insurance powder, sulfamethazine, analgin, caprolactam, etc., as

well as the purification of chloroform, phenylpropane sulfone and benzaldehyde. The

photographic industry is used as a fixative for the fixer. The perfume industry is used to produce

vanillin. Used as a preservative for brewing industry, a rubber coagulant and a bleaching agent for

cotton bleaching. Organic intermediates, dyes, and tanning are used as reducing agents for

electroplating, wastewater treatment in oil fields, and as a mineralizer for mines.


It is used in printing and dyeing, organic synthesis, printing, tanning, pharmaceutical and other

departments; as a preservative, bleaching agent and loosening agent in food processing.

Used as a chemical reagent

(Printing and dyeing, photography, etc.), used as bleach mordant,

reducing agent rubber coagulant, also used in organic synthetic

pharmaceuticals and spices.

Items Index
Appearance White crystalline powder
Sodium Metabisulphite (Na2S2O5) % 97.21
SO2 % ≥ 65
Fe % ≤ 0.002
Clarity clear
Insoluble matter in nitric acid% ≤ 0.009
AS% <0.00009
Phosphoric acid test ≤ 4.2

Calcium Acetate

Sodium Benzoate

Sodium Propionate

Calcium Propionate