Sodium Metabisulphite USP

Sodium Metabisulphite also known as sodium pyrosulphite is an inorganic compound that is used as a disinfectant, antioxidant and preservative agent. It is used as used as a food additive and is known by the E number E223.


Sodium Metabisulphite is used as a preservative and antioxidant in food. It is also used for wine and beer making, in photography, as an excipient in some tablets such as paracetamol, to precipitate from auric acid, in waste treatment, as a bleaching agent in the production of coconut cream and in the oil and gas industry as a corrosion inhibitor or oxygen scavenger.


Chemical Name: Sodium Metabisulphite
Synonyms: Sodium Pyrosulphite
Mol. Formula: Na2S2O5
Mol. Weight: 190.11 g/mol
CAS No.: 7681-57-4


General Specifications

Test Specification…USP
Appearance A white or almost white, crystalline powder or colorless crystals
Solubility Freely soluble in water, slightly soluble in alcohol
Appearance of solution The solution is clear and colorless
Chloride Maximum 0.05%
Iron Maximum 0.002%
Thiosulphate Maximum 0.05%
Heavy metals Maximum 0.002%
Residual solvents Passes test
Assay Not less than 65% and not less than 67.4%


Shelf life, Storage and Packing

It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.


GLP, cGMP (FDA) Approved, ISO 9001, ISO 14001, ISO 45001, ISO 17025, ISO 22000, FSSC 22000, FSSAI, Halal and Kosher certified.
We observe WHO Good manufacturing practice and Good laboratory practice.

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