# NIOSH Pocket Guide to Chemical Hazards
Dicyclopentadiene | CAS 77-73-6
C10H12 | RTECS PC1050000
Synonyms & Trade Names Bicyclopentadiene; DCPD; 1,3-Dicyclopentadiene dimer; 3a,4,7,7a-Tetrahydro-4,7-methanoindene [Note: Exists in two stereoisomeric forms.] | DOT ID & Guide 2048 129
Exposure Limits | NIOSH REL: TWA 5 ppm (30 mg/m3)
OSHA PEL†: none
IDLH N.D. | Conversion 1 ppm = 5.41 mg/m3
Physical Description Colorless, crystalline solid with a disagreeable, camphor-like odor. [Note: A liquid above 90°F.]
MW: 132.2 | BP: 342°F | FRZ: 90°F | Sol: 0.02%
VP: 1.4 mmHg | IP: ? |  | Sp.Gr: 0.98 (Liquid at 95°F)
Fl.P(oc): 90°F | UEL: 6.3% | LEL: 0.8% |
Class IC Flammable Liquid Combustible Solid
Incompatibilities & Reactivities Oxidizers [Note: Depolymerizes at boiling point and forms two molecules of cyclopentadiene. Must be inhibited and maintained under an inert atmosphere to prevent polymerization.]
Measurement Methods None available
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; incoordination, headache; sneezing, cough; skin blisters; in animals: kidney, lung damage
Target Organs Eyes, skin, respiratory system, central nervous system, kidneys
See also: INTRODUCTION