© 2026 Sinochem Nanjing Corporation,
All Right Reserved
Product Name: Ethylenimine, Stabilized
Synonyms: Aziridine; EI; Aminoethylene
Chemical Formula: C2H5N
CAS Number: 151-56-4
Recommended Use: Chemical intermediate, polymer production
Supplier Details: Name, address, emergency contact details provided by manufacturer or importer
Emergency Phone Number: Provided by manufacturer
Relevant Identified Uses: Laboratory reagent, chemical manufacturing input
Classification: Flammable liquid (Category 2), Acute toxicity—oral (Category 2), Acute toxicity—dermal (Category 2), Acute toxicity—inhalation (Category 2), Skin corrosion (Category 1B), Carcinogenicity (Category 2)
Signal Word: Danger
Hazard Statements: Highly flammable liquid and vapor; fatal if swallowed, in contact with skin or if inhaled; causes severe skin burns and eye damage; suspected of causing cancer
Pictograms: Skull and crossbones, Flame, Corrosion, Health hazard
Precautionary Statements: Avoid all contact with skin, eyes, and clothing; keep away from heat, sparks, open flames; avoid inhalation of vapors or mists; wear suitable protective clothing, gloves, and eye/face protection; use only outdoors or in a well-ventilated area
Chemical Name: Ethylenimine
Concentration: About 100%, with stabilization agent (commonly sodium hydroxide or potassium carbonate, typically less than 0.5%)
Stabilizer: Sodium hydroxide or potassium carbonate
Impurities: None reported at hazardous concentrations
Eye Contact: Rinse cautiously with water for several minutes; remove contact lenses; seek immediate medical attention
Skin Contact: Remove all contaminated clothing quickly; rinse skin with plenty of water or shower; get medical help right away
Inhalation: Move person into fresh air without delay; keep comfortable for breathing; seek immediate medical aid; if not breathing, provide artificial respiration
Ingestion: Do not induce vomiting; rinse mouth if person is conscious; never give anything by mouth to an unconscious person; seek immediate medical care
Most Important Symptoms/Effects: Burns, respiratory distress, convulsions, headache, dizziness, potential delayed carcinogenic effects
Suitable Extinguishing Media: Dry chemical, carbon dioxide, alcohol-resistant foam; avoid water jets, which may spread fire
Unsuitable Extinguishing Media: Water streams
Special Hazards: Vapors may form explosive mixtures with air; combustion produces toxic gases including nitrogen oxides and carbon monoxide; container rupture is possible in high heat
Protective Equipment for Firefighters: Self-contained breathing apparatus; full protective suit
Advice for Firefighters: Stay upwind; avoid runoff into waterways; use water spray to cool unopened containers
Personal Precautions: Evacuate area; ventilate space; eliminate all sources of ignition; avoid breathing vapors; put on protective clothing
Environmental Precautions: Prevent entry into sewers, waterways, soil
Methods for Containment and Cleaning Up: Dike spill with inert absorbent (vermiculite, sand); collect residue in sealable chemical-waste containers; clean contaminated surface thoroughly; dispose through licensed hazardous waste handler
Precautions for Safe Handling: Use in fume hood or well-ventilated area; avoid contact with skin, eyes, and clothing; avoid vapor inhalation; avoid static discharge, spark, open flame
Hygiene Measures: Wash hands and exposed skin after handling; remove contaminated clothing; do not eat, drink, or smoke while using
Conditions for Safe Storage: Store in cool, dry, well-ventilated place, away from incompatible materials (acids, oxidizing agents, anhydrides); keep tightly closed in corrosion-resistant containers; segregate from food and feedstuffs; clearly label area and restrict access; monitor for leaks or peroxides
Exposure Limits: OSHA PEL—none set; ACGIH TLV—0.5 ppm (1.2 mg/m³) as TWA; NIOSH REL—0.5 ppm (1.2 mg/m³) TWA
Engineering Controls: Chemical fume hood; explosion-proof local exhaust; vapor monitoring
Eye/Face Protection: Chemical safety goggles; face shields recommended
Skin Protection: Impervious gloves (nitrile, butyl rubber); full-body acid-resistant suit; rubber boots recommended
Respiratory Protection: NIOSH-approved air-purifying or supplied-air respirator suited to concentration; emergency self-contained breathing apparatus
Other Protective Measures: Emergency eye wash and safety shower within immediate reach
Appearance: Colorless, clear liquid
Odor: Ammonia-like, penetrating
Odor Threshold: Not established
pH: Alkaline (with stabilizer), neutral to slightly basic
Melting Point/Freezing Point: -77°C
Boiling Point: 56-58°C
Flash Point: -15°C (closed cup)
Evaporation Rate: Rapid
Flammability: Readily flammable
Upper/Lower Flammability or Explosive Limits: Upper: 48%, Lower: 4.2% (volume in air)
Vapor Pressure: 155 mmHg (20°C)
Vapor Density: 1.6 (air = 1)
Relative Density: 0.837 (water = 1)
Solubility: Miscible in water and many organic solvents
Partition Coefficient (n-octanol/water): Data unavailable
Auto-ignition Temperature: 276°C
Decomposition Temperature: Not determined
Viscosity: Low
Chemical Stability: Tends to polymerize spontaneously; stabilizer slows this process
Conditions to Avoid: Heat, sparks, flames, sources of static discharge; incompatible chemicals
Incompatible Materials: Acids, oxidizing agents, halogens, anhydrides, acid chlorides
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, nitrogen oxides, hydrogen cyanide (under combustion)
Hazardous Reactions: Risk of violent polymerization and explosion without stabilizer; emits toxic vapors if decomposed by heat
Routes of Exposure: Inhalation, skin and eye contact, ingestion
Acute Toxicity: LD50 oral (rat): 12 mg/kg; LC50 inhalation (rat): 42 ppm/4 hours; LD50 dermal (rabbit): 65 mg/kg (highly toxic)
Skin Corrosion/Irritation: Causes severe burns and blistering
Serious Eye Damage/Irritation: Causes severe burns, possible blindness
Respiratory/Skin Sensitization: Possible sensitizer
Germ Cell Mutagenicity: Suspected mutagen based on animal tests
Carcinogenicity: Suspected human carcinogen (IARC Group 2B)
Reproductive Toxicity: Data limited; animal studies suggest possible reproductive effects at high doses
STOT—Single Exposure: Respiratory tract irritation, central nervous system effects
STOT—Repeated Exposure: May affect liver and kidneys
Aspiration Hazard: No data available
Toxicity: Acute aquatic toxicity to fish and invertebrates; EC50 (Daphnia magna): 6.6 mg/L (48 hr); LC50 (Fish): 20 mg/L (96 hr); toxic to bacteria
Persistence/Degradability: Biodegradable over time; risk of local contamination during spills
Bioaccumulative Potential: Low (likely to degrade or volatilize); log Kow estimate < 1
Mobility in Soil: High (spreads rapidly in groundwater or soil if released)
Other Adverse Effects: Raises local pH, toxicity concerns for aquatic environments; avoid discharge to environment
Waste Handling: Hand over to licensed hazardous waste disposal contractors
Disposal Methods: Strictly follow local, regional, and national regulations; collect liquid in secure, labeled chemical waste drums; do not mix with other wastes; incineration recommended under controlled conditions with scrubber systems
Contaminated Packaging: Rinse drums with compatible solvents; treat rinsate as hazardous waste; label and dispose through specialized companies
UN Number: UN1185
UN Proper Shipping Name: Ethylenimine, Stabilized
Transport Hazard Class: 3 (Flammable liquids); subsidiary risk: 6.1 (Toxic substance)
Packing Group: I
Marine Pollutant: Not listed, but toxicity requires caution
Special Precautions: Ship in tightly sealed, stabilized containers; segregate from acids, oxidizers; mark with poison and flammable labels
Regulatory Transport Requirements: Comply with local, state, federal, and international transport laws (DOT, IMDG, IATA)
OSHA Status: Regulated hazardous substance
SARA Title III — Sections 302, 304, 313: Listed for emergency response, reporting threshold at or above 1 lb releases
California Proposition 65: Suspected carcinogen; listed chemical
TSCA Status: Listed on TSCA Inventory
WHMIS Classification: Flammable Liquid, Toxic, Corrosive, Carcinogenic
EPA CERCLA RQ: 1 lb (0.454 kg) for spills or releases
Other Labels: Strict workplace restrictions, personal exposure monitoring, and training for those exposed recommended
