Is QUATERNIUM-51 safe to use in EU cosmetics?

QUATERNIUM-51 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 1463-95-2?

CAS 1463-95-2 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 QUATERNIUM-51?

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 7925015/10/2010

QUATERNIUM-51

2-[2-[(5-bromo-2-pyridyl)amino]vinyl]-1-ethyl-6-methylpyridinium iodide

QUATERNIUM-51 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 1463-95-2

CAS 1463-95-2PubChem CID 6451275

2-(2-((5-Bromo-2-pyridyl)amino)vinyl)-1-ethyl-6-methylpyridinium iodide

IUPAC name: 5-bromo-N-[(E)-2-(1-ethyl-6-methylpyridin-1-ium-2-yl)ethenyl]pyridin-2-amine iodide

Molecular formula: C15H17BrIN3
Molecular weight: 446.12 g/mol
Exact mass: 444.96506 Da
Topological polar surface area: 28.8 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 3
Covalent units: 2
Defined stereocentres: 0

Also known as

Quaternium-51EINECS 215-976-55-bromo-N-[(E)-2-(1-ethyl-6-methylpyridin-1-ium-2-yl)ethenyl]pyridin-2-amine;iodide2-(2-((5-Bromopyridin-2-yl)amino)vinyl)-1-ethyl-6-methylpyridin-1-ium iodidePyridinium, 2-(2-((5-bromo-2-pyridinyl)amino)ethenyl)-1-ethyl-6-methyl-, iodide2-[2-[(5-Bromo-2-pyridinyl)amino]ethenyl]-1-ethyl-6-methylpyridinium iodide (1:1)5-bromo-N-[(E)-2-(1-ethyl-6-methylpyridin-1-ium-2-yl)ethenyl]pyridin-2-amine

Open full PubChem record PubChem annotations 3D structure image

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for QUATERNIUM-51

INCI name

QUATERNIUM-51

Description

2-[2-[(5-bromo-2-pyridyl)amino]vinyl]-1-ethyl-6-methylpyridinium iodide

Record provenance

Inventory reference: 79250
Imported identity: QUATERNIUM-51
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for QUATERNIUM-51

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Key data

CAS

1463-95-2

215-976-5

Restriction

—

Function

ANTISTATIC: Preventing and/or reducing static electricity by neutralising electrical charge on surfaces.

Official EU ingredient-name evidence

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

#23851 · QUATERNIUM-51

Ingredients with overlapping formulation functions

QUATERNIUM-30ANTISTATIC, HAIR CONDITIONING

QUATERNIUM-33ANTISTATIC, HAIR CONDITIONING

QUATERNIUM-43ANTISTATIC

QUATERNIUM-45ANTISTATIC

QUATERNIUM-52ANTISTATIC, HAIR CONDITIONING, SURFACTANT - CLEANSING

QUATERNIUM-53ANTISTATIC, HAIR CONDITIONING

QUATERNIUM-56ANTISTATIC, HAIR CONDITIONING

QUATERNIUM-60ANTISTATIC, HAIR CONDITIONING

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 QUATERNIUM-51 appears in the CosIng inventory

The CosIng inventory lists QUATERNIUM-51 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.

QUATERNIUM-51 is also tagged with 1 cosmetic function 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

QUATERNIUM-51 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, QUATERNIUM-51 carries the following function designation(s):

ANTISTATIC

CAS 1463-95-2 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 QUATERNIUM-51

This page reproduces the CosIng inventory entry for QUATERNIUM-51 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 QUATERNIUM-51 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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