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Sodium Metabisulphite


Name : Sodium Metabisulphite

Grade : Food

Description : Sodium Metabisulphite is a free flowing crystalline powder with odor of SO 2

Formula : Na 2 S 2 O 5

Synonyms : Anhydrous Sodium Bisulphite, Sodium Pyrosulphite, Sodium disulphite

Molecular Weight : 190.12

Bulk Density : 1.2 - 1.3 kg/dm 3

Appearance : White free flowing crystals

Appearance of 20% Solution: Clear & Colorless or Pale yellow.

CAS NO : 7681-57-4


Assay % w/w 98.0 Min.
SO2 % w/w 66.0 Min.
Sulphate PPM 2.5 Max.
Clarity of 10% Clear
Insoluble % w/w 0.05 Max.
Iron (as Fe) PPM 5 Max.
Heavy Metal PPM 10 Max.
pH of 5% Solution@250C 4.0 – 4.8
Sodium Thiosulphate % w/w 0.01 Max.
Arsenic (as As) PPM 1 Max.
Copper PPM 2 Max.
Chloride as NaCl PPM 50 MAX.
Zinc PPM 2 MAX.

Analysis Methods

The indicated values are determined according to our Standard Analysis method, which can be produced on request. Test Method used: IS11752 BIS 1986

Standard Packing

25 Kg Polypropylene Woven / paper bags with heat sealed inner liner.

500 Kg and 1000 Kg Jumbo Bags.

Storage & Handling

Store the product in a cool & and dry place. It absorbs moisture & oxidizes if container is not kept tightly closed. If heated over 60 o C, SO 2 is evolved, forming Sodium Sulphite.

For more information kindly refer to the Material Safety Data Sheet.

Major Applications of Sodium Metabisulphite

Effluent water-treatment to remove excess Chlorine & detoxification of Chromic acid in electroplating industries.

Food Industry as: 1.Preservative (Dehydrated foods, Shrimps, Meat etc), 2. Anti-browning, 3. Anti- fermentation & 4. Bleaching.

Photographic Industry for production of developer Solution / Acidizing Fixation Baths.

Chemical synthesis in the production of Sulphonates, Resins, Iodine & Acrylic Fibres.

Purification of Aldehydes & Ketones.

Pulp and Paper for De-lignification and Textile as Bleaching Agent, Anti-Chlor and Anti peroxides.

Tanneries as an Auxiliary in Decalcification & Bleaching Process.

Starch Production as bleaching agent & bactericidal.

Mining Industry as Floating agent., cyanide detoxification

Processing of Latex as preservative & Bleaching agent.

Steam boiler & drilling water as a oxygen scavenger.

Manufacturing of Indigo Vats dyes.

Reverse Osmosis as antichlor

Medical as manufacturing of anti oxidant drugs

Brewing as bactericidal

This Technical data sheet Identified as TDS / SM / 0108. Cancels & replaces all previous editions.

The data contained herein are given purely as a guide. W e undertake no responsibility either for the results-deriving from their adoption or for possible position in apparent contrast with existing patent right.