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
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