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Polymers and thermoplastics

Aziridine

Also known as Ethyleneimine, Ethylenimine, Azacyclopropane

CAS 151-56-4Formula C2H5NMolar mass 43.07 g/molEC 205-793-9
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Acute toxicity (severe), Serious health hazard 52 suppliers listed
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Aziridine chemical structure, C2H5N, CAS 151-56-4
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Oily, water-white liquid
Melting point
-71.5 °C
Boiling point
55 to 56
Density
Relative density (water = 1): 0.8
Flash point
-11 °C
HS code
293399
Category
Polymers and thermoplastics
UN number
UN 1185
Illustrative photo, an amber glass solvent bottle with clear liquid on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Aziridine?

Plain description, key identifiers and synonyms

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.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
aziridine
CAS number
151-56-4 CAS number cross-checkedOther or deprecated CAS: 49553-93-7
EC number
205-793-9
Molecular formula
C2H5N
UNII
54P5FEX9FH
MDL number
MFCD00039669, MFCD00803910
INCI name
PEI-10, PEI-1000, PEI-1400, PEI-14M
InChIKey
NOWKCMXCCJGMRR-UHFFFAOYSA-N
InChI
InChI=1S/C2H5N/c1-2-3-1/h3H,1-2H2
SMILES (canonical and isomeric)
C1CN1

Synonyms

  • Ethyleneimine
  • Ethylenimine
  • Azacyclopropane
  • Dimethyleneimine
  • Dihydroazirene
  • Azirane
  • Aziran
  • Aethylenimin
  • Dihydroazirine
  • Ethyleenimine
  • Aziridin
  • Etilenimina
  • Dihydro-1H-azirine
  • 1H-Azirine, dihydro-
  • Dimethylenimine
  • RCRA waste number P054
  • TL 337
  • Ethylene imine
  • Dow PEI-6
  • Dow PEI-600e
  • Dow PEI-18
  • Ethylene imine polymer
  • Polyethylenimine, linear
  • Poly(ethyleneimine) solution
  • Ethylene imine polymer(PEI)
Show all 34 synonyms
  • EI
  • PEI
  • Polyethylenimine, linear(PEI)
  • PEI 600
  • Poly(ethyleneimine) solution(PEI)
  • P 1000 (VAN)
  • RCRA waste no. P054
  • Polyethylenimine Linear
  • Ethylene imine polymer,

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Oily, water-white liquidexp.
Odour
Pungent, ammonia-like odorexp.
Melting point
-71.5 °Cexp.
Boiling point
55 to 56exp.
Density
Relative density (water = 1): 0.8exp.
Flash point
-11 °Cexp.
Autoignition temperature
320 °Cexp.
Solubility
In water, 1 × 10⁺⁶ mg/L (miscible)exp.
Vapour pressure
213 mm Hg at 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
43.07 g/molcalc.
Exact mass
43.0422 Dacalc.
LogP (octanol/water)
-0.41calc.
Topological polar surface area
21.94 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, C1CN1

C1CN1

1 ring, 3 atoms. This chemical is the scaffold itself.

720 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS02: Flammable
Flammable
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment
343NFPA 704 rating

Hazard statements

  • H225Highly flammable liquid and vapour.
  • H300Fatal if swallowed.
  • H310Fatal in contact with skin.
  • H314Causes severe skin burns and eye damage.
  • H330Fatal if inhaled.
  • H340May cause genetic defects.
  • H350May cause cancer.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (35)
  • P203Obtain, read and follow all safety instructions before use.
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P352If on skin: Wash with plenty of water.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P318If exposed or concerned, get medical advice.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 1185
Transport hazard class
6.1
Packing group
I

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Aziridine suppliers

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All 52 suppliers
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Where suppliers are based

52 suppliers in 10 countries

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Aziridine price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Ethyleneimine is used to manufacture triethylene melamine and is used in its polymeric form in paper and textile chemicals, adhesive binders, petroleum refining chem, fuels & lubricants, coating resins, varnishes, lacquers, agricultural chemicals, cosmetics, ion exchange resins, photographic chemicals, colloid flocculants and surfactants.

Monomer for polyethyleneimine.

Comonomer for polymers (eg, with ethylenediamine).

Chemical intermediate for N-(2-hydroxyethyl)ethyleneimine.

Ethyleneimine is used in polymerization products, as a monomer for polyethyleneimine, as a comonomer for polymers (e.g., with ethylenediamine), and in paper and textile chemicals, adhesives, binders, petroleum refining chemicals, fuels and lubricants, coating resins, varnishes, lacquers, agricultural chemicals, cosmetics, ion exchange resins, photographic chemicals, and surfactants.

Use classes: Cosmetics.

Cosmetic ingredient, INCI name PEI-10(viscosity controlling)

Roles

  • aetiopathogenetic role
  • alkylating agent
  • genotoxin
  • mutagen

Functional uses

  • Binder
  • Chelating agent
  • Chemical reaction regulator
  • Dispersing agent
  • Viscosity modifier

Cosmetic functions

  • Viscosity controlling

Pharmacology

Ethyleneimine is a monofunctional alkylating agent with potential antineoplastic activity. Reacting with DNA mainly at guanine and adenine residues, ethylenimine alkylates DNA, thereby producing DNA interstrand crosslinks and DNA breaks, and interfering with DNA replication and cell division. (NCI04)

How it is made

Prepared by treating 2-chloroethylamine hydrochloride with sodium hydroxide ... from beta-aminoethylsulfuric acid by reaction with sodium hydroxide...

Prepn: Ethanolamine is (esterified) by sulfuric acid to ethanolamine-sulfuric acid ester, which is reacted with sodium hydroxide in a normal reaction to form ethyleneimine.

Reaction of ammonia with ethylene dichloride

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 613-001-00-1

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Aziridine, Ref no: 733, Annex ref: II/733

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Aziridine is traded under.

HS 2933.99Indicative HS code

Heterocyclic compounds with nitrogen hetero-atom(s) only, other

World exports in 2024
$12.1B
−31.0% vs 2023, imports $28.8B
2019 to 2024
Top exporters
  1. China30.5%
  2. India * partner reported16.3%
  3. Ireland9.0%
Top importers
  1. Slovenia31.7%
  2. Italy24.2%
  3. United States5.0%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Aziridine is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Aziridine, based on the data on this page

What is 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.

What is the CAS number of Aziridine?

The CAS registry number of Aziridine is 151-56-4. Other or deprecated CAS numbers: 49553-93-7.

What is the molecular formula and weight of Aziridine?

The molecular formula of Aziridine is C2H5N and its molar mass is 43.07 g/mol.

What is Aziridine used for?

Ethyleneimine is used to manufacture triethylene melamine and is used in its polymeric form in paper and textile chemicals, adhesive binders, petroleum refining chem, fuels & lubricants, coating resins, varnishes, lacquers, agricultural chemicals, cosmetics, ion exchange resins, photographic chemicals, colloid floccul…

Is Aziridine hazardous?

Aziridine carries the GHS signal word "Danger". Main hazards: highly flammable liquid and vapour, fatal if swallowed, fatal in contact with skin. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Aziridine?

Aziridine is usually classified under HS code 293399 (Heterocyclic compounds with nitrogen hetero-atom(s) only, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Aziridine?

CompoundList lists 52 suppliers of Aziridine in China, United States, United Kingdom, Germany and 6 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Aziridine in India?

1 supplier in India list Aziridine on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Aziridine?

Suppliers quote Aziridine on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Aziridine

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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