Colorless liquid. Monomeric form has terpene odor in vapor state.
Manufacture resins, in organic synth as diene in diels-alder reaction producing sesquiterpenes, synthetic alkaloids, camphors.
Registry Numbers and Inventories.
Swiss Giftliste 1
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
439 (25 C)
Odor Threshold Odor threshold 5.0 mg/m3
0.8021 g/cm3 (20 C)
Solubility in water
1.44632 (20 C)
Partition coefficient, pKow
Heat of vaporization
Hazards and Protection.
Monomer may largely be prevented from dimerizing by storage at -80C or below.
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Wear appropriate eye protection and protective clothing to prevent skin and eye contact.
Wear positive pressure self-contained breathing apparatus (SCBA).
Make no contact with the spilled material. ELIMINATE all ignition sources and ground all equipment. Stop leak if you can do it without risk. A vapor suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean non-sparking tools to collect absorbed material.
Incompatible with nitric acid; oxides of nitrogen; oxygen; sulfuric acid. Contact with strong oxidizing agents may cause explosions. Avoid contact with strong oxidizers, fuming nitric acid, sulfuric acid.
It decomposition violently @ high temp and pressure.
Upper exp. limit, %
Lower exp. limit, %
Dry chemical, carbon dioxide, foam
Moderate fire hazard, when exposed to heat or flame
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Toxic gases and vapors (such as carbon monoxide) may be released in fire involving cyclopentadiene.
TLV (as TWA): 75 ppm; 203 mg/m3 (ACGIH 1995-1996). OSHA PEL: TWA 75 ppm (200 mg/m3) NIOSH REL: TWA 75 ppm (200 mg/m3) NIOSH IDLH: 750 ppm
Mild central nervous system depression or excitation may occur after ingestion or vapor inhalation. CNS effects can occur secondary to hydrocarbon pneumonitis and hypoxia, or from additives and contaminants (aniline, heavy metals, camphor, or pesticides). Some hydrocarbons are simple asphyxiants (e.G., Methane, ethane, propane gasses) which can produce CNS effects secondary to hypoxia. In a prospective study in Toronto, major congenital malformations were noted in 13 of 125 fetuses of mothers exposed to organic solvents during pregnancy.
Nausea, vomiting, diarrhea, and abdominal pain may occur following ingestion.
Coughing, choking, tachypnea, dyspnea, cyanosis, rales, hemoptysis, pulmonary edema, pneumatoceles, lipoid pneumonia, or respiratory arrest may develop following ingestion and aspiration.
May cause irritation or burns.
Pure petroleum distillates - gastric decontamination is not indicated in the majority of accidental ingestions, since systemic toxicity is unlikely from a pure petroleum distillate. Other hydrocarbons - gastric decontamination may be indicated if a large amount of a toxic hydrocarbon has been ingested (e.G., Suicide attempt) and if spontaneous vomiting has not occurred. Decontamination may also be indicated for ingestions of highly toxic hydrocarbons (e.G., Halogenated hydrocarbons, carbon tetrachloride) and for hydrocarbons which contain very toxic additives (e.G., Heavy metals, pesticides). The decision to decontaminate should be based on the toxicity of the agent, the volume ingested, time of ingestion and patient's clinical status. The potential for rapid cns depression, with seizures and/or respiratory depression, must be considered.
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.
Remove and isolate contaminated clothing and shoes. Wash skin with soap and water. Flush with running water for at least 20 minutes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.