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CAS 7681-57-4

CAS 7681-57-4 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 7681-57-4
CAS 7681-57-4PubChem CID 656671

Sodium Pyrosulfite

Molecular formula
Na2O5S2
Molecular weight
190.11 g/mol
Exact mass
189.89825401 Da
Topological polar surface area
125.0 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
6
Covalent units
3
Defined stereocentres
0

Also known as

Sodium metabisulfiteSodium disulfiteDisodium pyrosulfiteNatrii disulfisCampden TabletsDisodium metabisulfiteNatrium pyrosulfitNatriummetabisulfit
16 more reported names
sodium pyrosulphiteSodium bisulfite anhydrousNatrium metabisulfurosumSodium pyrosulfite (Na2S2O5)Disodium pentaoxodisulfate4VON5FNS3CINS NO.223Sodium metabisulfite (e 223)INS-223NSC-158277NSC-227243DISODIUM PYROSULPHITEE-223CHEBI:114786Na(2)S(2)O(5)RefChem:6239
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External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 7681-57-4

1 total
No records found for this CAS number.

How CAS 7681-57-4 is used on this site

CAS 7681-57-4 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 7681-57-4 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.