CAS No.: 7681-57-4
Appearance: White crystals
Main content (Na2S2O5) %≥: 96.5
As %≤: 0.0001
Fe %≤: 0.003
Clarity: Pass test
Heavy metal (Pb) %≤: 0.0005
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Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5. The substance is sometimes referred to as disodium (metabisulfite). It is used as a preservative and antioxidant in food and is also known as E223.
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