Sodium Metabisulfite

White or light-yellow crystalline powder, smell of SO ₂. No other smell when dried. Specific gravity is 1.4. It's soluble in glycerine, it's soluble slightly in alcohol.

CAS No.:
7681-57-4
Molecular Formula:
H2O5S2.2Na
Molecular Weight:
192.12
EINECS:
231-673-0

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DESCRIPTION

DESCRIPTION

SODIUM METABISULFITE

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SPECIFICATIONS

Item	Standard
Content	99.90% Min
Acid value (mg KOH/g)	0.03 Max
Crystalling point	18.20*C Min
Transmittance (400nm)	96.0% Min
Refractive index (20 *C)	1.4775-1.4790
Moisture	0.10% Max

APPLICATION

Used as a preservative, bleach, and loosening agent in food processing. Sodium metabisulfite is used in industries such as printing and dyeing, organic synthesis, printing, leather making, pharmaceuticals, etc;

Sodium metabisulfite is used in the chemical and pharmaceutical industries for the production of insurance powder, sulfamethoxazole, acetaminophen, caprolactam, as well as for the purification of formaldehyde from chloroform, phenylpropylsulfone, and benzene. An ingredient used as a fixing agent in the photography industry. The spice industry is used to produce vanillin. Used as a preservative in the brewing industry, a rubber coagulant, and a dechlorination agent after bleaching cotton fabric. Organic intermediates, dyes, and leather are used as reducing agents in the electroplating industry, wastewater treatment in oil fields, and mineral processing agents in mines.