Sodium Metabisulfite

Properties: white or yellowish crystalline powder, with strong SO2 smell, relative density of 1.4, easily soluble in water and glycerol, acidic aqueous solution, solubility increases with temperature, slightly soluble in ethanol. It is easy to oxidize and deteriorate in the exposed air, and continuously release SO2, and finally turn the product into sodium sulfate. Therefore, this product should not be stored for a long time. It will decompose when heated to 150 ℃.

Molecular formula: Na2S2O5

Molecular weight: 190.12

CAS NO .： 7681-57-4

Appearance: white fluid crystal or powder.

Packing: 25kg plastic woven bag or customized according to customer requirements.

【[National standard】GB1893-86
Item	Index
Na2S2O5%	≥ 65% (calculated by sulfur dioxide)
Fe	≤0.005
PH	4—4.6
Pb%	≤0.002
As%	≤0.0002
White or yellowish crystalline powder

Uses: used in the pharmaceutical industry to produce chloroform, phenylpropanesulfone and benzaldehyde; Used as coagulant in rubber industry; Printing and dyeing industry is used as dechlorination agent after bleaching of cotton cloth and cotton scouring assistant; Leather industry is used for leather treatment, which can make leather soft, plump, tough, waterproof, folding resistant, wear-resistant and so on; Chemical industry is used to produce hydroxyvanillin, hydroxylamine hydrochloride, etc; Used as developer in photosensitive industry; The food industry is used as bleach, preservative, loosening agent, antioxidant, color protecting agent and preservative.

Properties

It is used as preservative, bleach and loosening agent in food processing. In industry, sodium pyrosulfite is used in printing and dyeing, organic synthesis, printing, tanning, pharmaceutical and other departments; Sodium pyrosulfite is used in the chemical and pharmaceutical industries for the production of insurance powder, sulfamethazine, analgin, caprolactam, etc., as well as the purification of chloroform, phenylpropanesulfone and benzene formaldehyde. The photographic industry is used as an ingredient for fixing agents. Perfume industry is used to produce vanillin. It is used as preservative in brewing industry, rubber coagulant and dechlorination agent after cotton bleaching. Organic intermediates, dyes and tanning are used as reducing agents, electroplating industry, oilfield wastewater treatment and mineral dressing agent in mines.

CAS No.

7681-57-4

Formula

Na2O5S2

Molecular Mass

190.10700

Exact Mass

189.89800

PSA

124.92000

Logp

0.27220