Official EU label nameGlossary entry 17483

NITROUS ACID

This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.

Global evidence snapshot

The resolved identity has matching regulatory evidence in 0 of 13 indexed market datasets: 0 country records and 0 EU Annex records. Every result and evidence gap is listed below.

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Evidence gaps

Resolved identifiers

Resolved substance identity

CAS:7782-77-6

EC:231-963-7

Ingredient index records:

NITROUS ACID

Cosmetic functions: HUMECTANT, SOLVENT

Nitrous Acid is the acid that conforms to the formula:

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1 matched or reported name

NITROUS ACID

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name NITROUS ACID.

That is a statement about this inventory, not about the law: no imported rule is not evidence that a substance is permitted. A rule may exist under a different name, under a CAS or EC number this glossary entry does not carry, or in a dataset not yet imported.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 7782-77-6

CAS 7782-77-6PubChem CID 24529

Nitrous Acid

Nitrous acid is a nitrogen oxoacid. It is a conjugate acid of a nitrite. — ChEBI

IUPAC name: nitrous acid

Molecular formula: HNO2
Molecular weight: 47.014 g/mol
Exact mass: 47.000728275 Da
XLogP3: -0.3
Topological polar surface area: 49.7 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 3
Covalent units: 1
Defined stereocentres: 0

Also known as

Nitrosyl hydroxideHNO2Kyselina dusitedioxonitric acidhydroxidooxidonitrogenAcid, NitrousT2I5UM75DNhydrogen dioxonitrate(1-)

16 more reported names

CHEBI:25567(NO(OH))[NO(OH)]RefChem:6071231-963-7HONOKyselina dusite [Czech]EINECS 231-963-7UNII-T2I5UM75DNHSDB 7801Nitrogen dioxide ionNitrous acid, transNitrogen peroxide ionNITROUS ACID [MI]SCHEMBL1057SCHEMBL9214

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External database identifiers

ChEBI:CHEBI:25567
ChEMBL:CHEMBL1161681
EPA DTXSID:DTXSID7064813
PubMed:25803049
PubMed:25421879
PubMed:18167491
PubMed:10320667
PubMed:10024740
PubMed:1569239

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

Additional authoritative substance research

Each link searches that source for this identity. A link is a research route, not a claim that the source holds an exact record. What each source is, and its legal weight

Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal US EPA CompTox CTX APIs

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Official source and scope

Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.

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