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Sodium Metabisulphite Food Grade

Sodium Metabisulfite

Sodium Metabisulphite

Name: Sodium Metabisulphite

Molecular formula: Na2S2O5


Molecular weight: 190.10

Synonmys:Sodium pyrosulfite;disodium disulphite; sodium pyrosulphite;disodium oxidosulfanesulfonate oxide;


Sodium Metabisulfite Property:

White or slightly yellow crystalline powder. Soluble in water, acidic aqueous solution. Soluble in glycerol, slightly soluble in ethanol. Easily decompose when sodium metabisulphite 97% becomes wet , When exposed in air it will easily oxidize into sulfate. Emit sulfur dioxide and generate the corresponding salts when Sodium pyrosulfite contacts with acid. Sodium metabisulfite 96.5% powder will decompose when heated to 150 ℃.

disodium disulphite can be divided into third categories according to its use: sodium metabisulfite in food and sodium metabisulfite in technology .


Test Items

Quality standards

Sodium metabisulphite 96.5%

Sodium metabisulphite 97%

Content(as Na2S2O5), %

96.5 min

97 min

Content(as SO2), %

65.0 min

65.0 min

Iron (Fe), %   

0.003 max

0.003 max

Clarity, %

A little turbid

A little turbid

Heavy metal( as Pb), %


0.0005 max

Arsenic(As), %


0.0001 max

PH value




Sodium Metabisulfite Application:

1) In Pharma Industry

2) In food industry : Sodium metabisulphite food grade can be used as a bleaching agent, preservative agent , antioxidants

3) In leather industry: makes leather soft, well developed, tough water proof,anti-break, wear ability

4) In dye industry:  used as dechlorination agent and cotton boiling off agent for bleached cotton. 

Packing: Packed in polypropylene bag lined with polyethylene bag.

Net wt: 25, 50, 1000Kg/bag.