Is NITROUS ACID safe to use in EU cosmetics?

NITROUS ACID is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Always verify against the current official CosIng database before formulating.

What other records share CAS 7782-77-6?

CAS 7782-77-6 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

How do I check if my formula contains NITROUS ACID?

Use the INCI Checker to screen a full ingredient list across selected markets, or use the substance market comparison to review this identity across all supported market datasets.

InventoryRef 9847007/07/2020

NITROUS ACID

Nitrous Acid is the acid that conforms to the formula:

NITROUS ACID is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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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

Open full PubChem record PubChem annotations 3D structure image

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.

Inventory details for NITROUS ACID

INCI name

NITROUS ACID

Description

Nitrous Acid is the acid that conforms to the formula:

Record provenance

Inventory reference: 98470
Imported identity: NITROUS ACID
Source update: 07/07/2020

European Commission CosIng source notes

Annex records for NITROUS ACID

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Key data

CAS

7782-77-6

231-963-7

Restriction

—

Function

HUMECTANT: Retaining and/or preserving the moisture in a product during use.
SOLVENT: Dissolving other components of cosmetics. Solvents are usually liquids (aqueous and nonaqueous).

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#17483 · NITROUS ACID

Ingredients with overlapping formulation functions

NEOPENTYL GLYCOLPLASTICISER, SOLVENT

NEOPENTYL GLYCOL DIPELARGONATEPLASTICISER, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SOLVENT

NITRIC ACIDSOLVENT

NITROETHANESOLVENT

OCOTEA QUIXOS LEAF OILSOLVENT

OCTADECANEPERFUMING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SOLVENT

OCTADECENESOLVENT, VISCOSITY CONTROLLING

OCTANESOLVENT

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox 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

How NITROUS ACID appears in the CosIng inventory

The CosIng inventory lists NITROUS ACID as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

NITROUS ACID is also tagged with 2 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

NITROUS ACID is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, NITROUS ACID carries the following function designation(s):

CAS 7782-77-6 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for NITROUS ACID

This page reproduces the CosIng inventory entry for NITROUS ACID from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research NITROUS ACID and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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Tools & next steps

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