# NIOSH Pocket Guide to Chemical Hazards
Propylene imine | CAS 75-55-8
C3H7N | RTECS CM8050000
Synonyms & Trade Names 2-Methylaziridine, 2-Methylethyleneimine, Propyleneimine, Propylene imine (inhibited), Propylenimine | DOT ID & Guide 1921 131P (inhibited)
Exposure Limits | NIOSH REL: Ca TWA 2 ppm (5 mg/m3) [skin] See Appendix A
OSHA PEL: TWA 2 ppm (5 mg/m3) [skin]
IDLH Ca [100 ppm] | Conversion 1 ppm = 2.34 mg/m3
Physical Description Colorless, oily liquid with an ammonia-like odor.
MW: 57.1 | BP: 152°F | FRZ: -85°F | Sol: Miscible
VP: 112 mmHg | IP: 9.00 eV |  | Sp.Gr: 0.80
Fl.P: 25°F | UEL: ? | LEL: ? |
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities Acids, strong oxidizers, water, carbonyl compounds, quinones, sulfonyl halides [Note: Subject to violent polymerization in contact with acids. Hydrolyzes in water to form methylethanolamine.]
Measurement Methods None available
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) Change: No recommendation Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
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 Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Eye, skin burns; [potential occupational carcinogen]
Target Organs Eyes, skin Cancer Site [in animals: nasal tumors]
See also: INTRODUCTION