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InventoryRef 9526523/02/2018

AZIRIDINE

Azacyclopropane,Ethylenimine

AZIRIDINE is linked to 1 EU annex record on this page. Inventory note: CMR1B.

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Regulatory evidence by market

This matrix separates verified ingredient rules from sources that are mapped but not yet imported. No imported rule does not mean the ingredient is permitted.

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MarketEvidence statusRecordsSource language
European UnionEvidence linked
Prohibited entry found
Open this evidence		1English and EU languages
Great BritainEvidence linked
Prohibited
Open this evidence		1English
CanadaSource mapped
Official source mapped; ingredient rule not imported
0English and French
New ZealandEvidence linked
Prohibited
Open this evidence		1English
ASEANEvidence linked
Prohibited
Open this evidence		1English and national languages
ChinaEvidence linked
Prohibited
Open this evidence		1Chinese with selected English material
JapanSource mapped
Official source mapped; ingredient rule not imported
0Japanese; official English translation available
South KoreaEvidence linked
Prohibited
Open this evidence		1Korean with some English names
United StatesSource mapped
Official source mapped; ingredient rule not imported
0English
AustraliaSource mapped
Official source mapped; ingredient rule not imported
0English
BrazilEvidence linked
Prohibited
Open this evidence		1Portuguese with INCI crosswalks
IndiaEvidence linked
Prohibited
Open this evidence		1English and Hindi
Saudi ArabiaEvidence linked
Prohibited
Open this evidence		1Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 151-56-4
CAS 151-56-4PubChem CID 9033

Aziridine

Aziridine is a member of aziridines, a saturated organic heteromonocyclic parent and an azacycloalkane. It has a role as an alkylating agent. It is a conjugate base of an aziridinium. — ChEBI

IUPAC name
aziridine
Molecular formula
C2H5N
Molecular weight
43.07 g/mol
Exact mass
43.042199164 Da
XLogP3
-0.4
Topological polar surface area
21.9 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

ETHYLENEIMINEEthylenimineAzacyclopropaneDimethyleneimineDihydroazireneAziraneAziranAethylenimin
16 more reported names
DihydroazirineEthyleenimineAziridinEtileniminaDihydro-1H-azirine1H-Azirine, dihydro-DimethylenimineRCRA waste number P054ENT-50324TL 33754P5FEX9FHCHEBI:30969RefChem:596749205-793-9Ethylene imineDow PEI-6
Open full PubChem recordPubChem annotations3D structure image
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.

Inventory details for AZIRIDINE

INCI name

AZIRIDINE

Description

Azacyclopropane,Ethylenimine

Record provenance

Inventory reference
95265
Imported identity
AZIRIDINE
Source update
23/02/2018
European Commission CosIng source notes
Annex II Shared CAS number
Entry 733

Aziridine

CAS: 151-56-4
EC: 205-793-9

Key data

CAS
151-56-4
EC
205-793-9
Restriction
CMR1B
Function
NOT REPORTED
No function currently reported.

Ingredients with overlapping formulation functions

ARGININE MANDELATENOT REPORTED
ARTEMISIA TRIDENTATANOT REPORTED
ASPERGILLUS/FERMENT FILTRATENOT REPORTED
ASPERGILLUS/TANNIC ACID FERMENT EXTRACTNOT REPORTED
BACILLUS EXTRACTNOT REPORTED
BARIUM CHLORIDENOT REPORTED
BARIUM GLUCONATENOT REPORTED
BARIUM HEXAFERRITENOT REPORTED

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 chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How AZIRIDINE appears in the CosIng inventory

The CosIng inventory lists AZIRIDINE as a cosmetic ingredient and this page links it to 1 annex record. The inventory entry captures names and identifiers, while the annex record shows where the substance is prohibited, restricted or positively listed in EU cosmetics law.

AZIRIDINE 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

AZIRIDINE appears in the EU CosIng inventory and has linked annex records. Check the annex records above for applicable restrictions, concentration limits and conditions of use. Annex II listing means prohibited; Annex III means restricted; Annexes IV, V and VI mean permitted under specified conditions.

The restriction field for AZIRIDINE reads: "CMR1B". This is the restriction note recorded in the CosIng inventory for this ingredient. For authoritative conditions and limits, always refer to the linked annex entries above.

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

CAS 151-56-4 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 AZIRIDINE

This page combines the CosIng inventory entry for AZIRIDINE with 1 linked Annex II–VI record from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research AZIRIDINE 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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