NIOSH Pocket Guide to Chemical Hazards


CAS 151-56-4


RTECS KX5075000
Synonyms & Trade Names
Aminoethylene, Azirane, Aziridine, Dimethyleneimine, Dimethylenimine, Ethylenimine, Ethylimine
DOT ID & Guide
1185 131P (inhibited)


NIOSH REL: Ca See Appendix A
OSHA PEL: [1910.1012] See Appendix B
IDLH Ca [100 ppm] See: 151564 Conversion 1 ppm = 1.76 mg/m3
Physical Description
Colorless liquid with an ammonia-like odor. [Note: Usually contains inhibitors to prevent polymerization.]
MW: 43.1
BP: 133°F
FRZ: -97°F
Sol: Miscible
VP: 160 mmHg
IP: 9.20 eV

Sp.Gr: 0.83
Fl.P: 12°F
UEL: 54.8%
LEL: 3.3%

Class IB Flammable Liquid: Fl.P. below 73F and BP at or above 100F.
Incompatibilities & Reactivities
Polymerizes explosively in presence of acids [Note: Explosive silver derivatives may be formed with silver alloys (e.g., silver solder).]
Measurement Methods
NIOSH 3514
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated/Daily
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations (See Appendix E) NIOSH
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; nausea, vomiting; headache, dizziness; pulmonary edema; liver, kidney damage; eye burns; skin sensitization; [potential occupational carcinogen]
Target Organs Eyes, skin, respiratory system, liver, kidneys

Cancer Site [in animals: lung & liver tumors]
See also: INTRODUCTION   See ICSC CARD: 0100   See MEDICAL TESTS: 0102