NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005




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
Ca [100 ppm] See: 151564
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
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
Important additional information about respirator selection
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
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