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Chemical Name: Ethylenimine
Synonyms: Aziridine, Aminoethylene
CAS Number: 151-56-4
Molecular Formula: C2H5N
Recommended Use: Intermediate in organic synthesis, epoxy resin crosslinker, biocide
Supplier Information: Manufacturer details required for workplace contacts
Emergency Contact: National Poison Control Center or local emergency services
UN Number: UN1185
EC Number: 205-793-9
Uses Advised Against: Consumer applications
Classification: Flammable liquid, Acute toxicity (oral, dermal, inhalation), Skin corrosion, Eye damage, Carcinogenicity Category 2, Germ cell mutagenicity Category 1B
Signal Word: Danger
Hazard Statements: Extremely flammable liquid and vapor; fatal if swallowed, in contact with skin or if inhaled; causes severe skin burns and eye damage; may cause genetic defects; suspected of causing cancer
Pictograms: Flame, Skull and Crossbones, Corrosion, Health Hazard
Precautionary Statements: Keep away from heat, sparks, open flames; Do not breathe fumes or vapors; Wear protective clothing, gloves and eye protection; Do not eat, drink or smoke during handling; Use only in a well-ventilated area
Chemical Name: Ethylenimine
Purity: >95%
CAS Number: 151-56-4
Hazardous Components: Pure compound; no stabilizer present in common preparations
Impurities: Residual water, trace formaldehyde possible depending on source
Inhalation: Remove the person from exposure; provide oxygen or artificial respiration as required; seek medical attention immediately
Skin Contact: Rinse thoroughly with water for at least 15 minutes while removing contaminated clothes; wash with soap; immediate medical care needed
Eye Contact: Rinse cautiously with water for at least 15 minutes lifting upper and lower eyelids; seek urgent ophthalmologic help
Ingestion: Do not induce vomiting; rinse mouth; never administer anything by mouth if unconscious; transport to emergency room promptly
Potential Symptoms: Burning pain, blurred vision, severe respiratory distress, nausea, central nervous system depression, risk of convulsions
Extinguishing Media: Alcohol-resistant foam, carbon dioxide, dry chemical, use water spray only to cool containers
Special Protective Equipment: Full-face self-contained breathing apparatus and chemical-protective suit
Unusual Fire Hazards: Vapor forms explosive mixtures even below room temperature; container rupture possible under heat
Hazardous Combustion Products: Nitrogen oxides, carbon monoxide, carbon dioxide
Firefighting Instructions: Prevent runoff from entering drains; cool adjacent containers with water fog
Personal Precautions: Evacuate all unnecessary personnel; use full chemical-resistant clothing and self-contained breathing apparatus
Environmental Precautions: Prevent release to waterways or sewers; notify authorities in case of significant spillage
Methods for Containment: Contain leaking material with sand, earth, or inert absorbent; ventilate area well
Cleanup Procedures: Collect spill in a chemically resistant container labeled for hazardous waste; dispose following regulations; decontaminate area with dilute acid solution, ventilate thoroughly
Handling: Avoid all contact with skin, eyes, and clothing; avoid inhalation of vapors; do not use near flames, spark sources, or hot surfaces
Storage: Keep containers tightly closed, stored in a cool, dry, well-ventilated area away from incompatible materials and direct sunlight; store under nitrogen or another inert gas to prevent polymerization
Incompatible Materials: Strong acids, oxidizers, carbon dioxide, copper, silver, aluminum, zinc
Recommended Materials for Containers: Stainless steel, glass lined vessels
Occupational Exposure Limits: OSHA TWA 0.05 ppm (0.09 mg/m3), ACGIH TLV 0.05 ppm
Engineering Controls: Explosion-proof ventilation and local exhaust; gas detection recommended
Personal Protective Equipment: Chemical splash goggles, face shield, butyl rubber or Teflon gloves, chemical resistant clothing, full-face air-purifying respirator or supplied-air respirator in high concentrations
Hygiene Measures: Wash hands, face after work; change contaminated clothing promptly; avoid eating, drinking, or smoking in work areas
Appearance: Colorless, clear liquid
Odor: Ammonia-like, strongly irritating
Melting Point: -78°C
Boiling Point: 56°C
Flash Point: -21°C (closed cup)
Autoignition Temperature: 304°C
Vapor Pressure: 92 mmHg at 25°C
Solubility: Miscible with water, alcohol, most organic solvents
Density: 0.828 g/cm3 at 20°C
pH: Alkaline when dissolved in water
Chemical Stability: Prone to spontaneous polymerization, especially at elevated temperature, in the presence of acids or CO2
Hazardous Reactions: Violent polymerization; reacts vigorously with acids, oxidizers, carbon dioxide
Conditions to Avoid: Heat, moisture, contamination, light
Decomposition: Toxic gases (nitrogen oxides, carbon monoxide, ammonia)
Incompatibility: Avoid contact with copper, iron salts, silver, strong oxidizing agents, mineral acids
Acute Toxicity: LD50 (oral, rat): 13 mg/kg; LC50 (inhalation, rat, 4h): 62 ppm
Routes of Exposure: Inhalation, skin absorption, ingestion, eye contact
Symptoms: Severe skin and eye burns, respiratory tract injury, pulmonary edema, convulsions
Carcinogenicity: Suspected human carcinogen (IARC Group 2B); animal data positive
Genotoxicity: Strong mutagenic activity in both in vivo and in vitro studies
Chronic Exposure: Potential for liver, kidney, and nervous system effects; possible reproductive toxicity
Aquatic Toxicity: LC50 (fish): 43 mg/L (96 hours, calculated); highly toxic to aquatic life
Persistence and Degradability: Strongly reactive, rapidly hydrolyzed in water
Bioaccumulation Potential: Not expected to bioaccumulate due to water solubility and reactivity
Other Adverse Effects: Potential for groundwater contamination at spill sites; possible formation of toxic secondary products in environment
Waste Treatment Methods: Incinerate in a chemical incinerator equipped with afterburner and scrubber
Contaminated Packaging: Triple rinse, puncture, dispose according to hazardous waste regulations
Special Precautions: Do not dispose of via soil, water systems, or general waste streams
Legal Compliance: Follow local, regional, and national regulations for hazardous waste
UN Number: UN1185
Proper Shipping Name: Ethylenimine, stabilized
Transport Hazard Class: 3 (Flammable liquid); 6.1 (Toxic substance)
Packing Group: I (Great danger)
Labels Required: Flammable liquid, Toxic
Special Transport Precautions: Protect from heat, must ship with suitable stabilizer, restrict movement during transport
OSHA Status: Regulated as a select carcinogen and hazardous chemical
TSCA Status: Listed on United States TSCA inventory
EU Regulation: REACH registered, subject to restrictions (Annex XVII), hazard labeling required
SARA Title III: Subject to Section 302, 313 reporting
California Proposition 65: Listed as causing cancer
Other Regulations: Subject to workplace exposure controls and environmental release reporting; restrictions in many countries for non-industrial use
