# NIOSH Pocket Guide to Chemical Hazards
Ethylidene norbornene | CAS 16219-75-3
C9H12 | RTECS RB9450000
Synonyms & Trade Names ENB, 5-Ethylidenebicyclo(2.2.1)-hept-2-ene, 5-Ethylidene-2-norbornene [Note: Due to its reactivity, ENB may be stabilized with tert-butyl catechol.] | DOT ID & Guide
Exposure Limits | NIOSH REL: C 5 ppm (25 mg/m3)
OSHA PEL†: none
IDLH N.D. | Conversion 1 ppm = 4.92 mg/m3
Physical Description Colorless to white liquid with a turpentine-like odor.
MW: 120.2 | BP: 298°F | FRZ: -112°F | Sol: ?
VP: 4 mmHg | IP: ? |  | Sp.Gr: 0.90
Fl.P(oc): 101°F | UEL: ? | LEL: ? |
Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F.
Incompatibilities & Reactivities Oxygen [Note: ENB should be stored in a nitrogen atmosphere since it reacts with oxygen.]
Measurement Methods None available
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: Daily Remove: When wet or contaminated Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; headache; cough, dyspnea (breathing difficulty); nausea, vomiting; olfactory, taste changes; chemical pneumonitis (aspiration liquid); in animals: liver, kidney, urogenital injury; bone marrow effects
Target Organs Eyes, skin, respiratory system, central nervous system, liver, kidneys, urogenital system, bone marrow
See also: INTRODUCTION