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Chemical Name: Dicyclopentadiene
CAS Number: 77-73-6
Common Appearance: Clear liquid, oily, with a strong, pungent odor
Uses: Intermediate in resin manufacture, inks, paints, pesticides, flame retardants
Hazard Class: Flammable liquid, toxic if inhaled or ingested, causes skin and eye irritation
Signal Word: Danger
Harmful Effects: Eye damage, skin burns, respiratory problems, central nervous system depression, aspiration hazard if swallowed
Key Risks: Explosive vapors near open flames, headache, dizziness, nausea from inhalation
Main Component: Dicyclopentadiene 95% or greater by weight
Other Trace Components: Cyclopentadiene, related hydrocarbons in minor amounts
Inhalation: Move person to fresh air, keep comfortable for breathing, seek immediate medical attention for difficulty in breathing or if symptoms persist
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and water, do not reuse clothing until fully cleaned, get prompt medical attention for persistent irritation
Eye Contact: Rinse cautiously with water for at least fifteen minutes, hold eyelids open, get prompt medical attention
Ingestion: Rinse mouth, do not induce vomiting, seek immediate medical help, risk of chemical pneumonia from aspiration
Suitable Extinguishing Media: Alcohol-resistant foam, dry chemical, carbon dioxide, water mist for cooling containers
Unusual Fire Hazards: Produces dense black smoke, toxic vapors, flammable and explosive vapor can travel long distances to ignition source
Protective Equipment: Full protective gear and self-contained breathing apparatus for firefighters, avoid inhalation of combustion byproducts
Special Instructions: Cool containers with flooding quantities of water, evacuate area, stay upwind, prevent firewater runoff from entering drains or waterways
Spill Response: Evacuate non-essential personnel, remove ignition sources, ensure adequate ventilation
Containment: Use non-sparking tools, absorb with earth, sand or other inert material, place in labeled containers for proper disposal
Environmental Precautions: Prevent entry into watercourses, drains or soil to limit impact on aquatic life
Personal Protection: Wear chemical goggles, resistant gloves, protective clothing, use respiratory protection if ventilation is insufficient
Handling: Keep container tightly closed, avoid breathing vapor, avoid contact with eyes, skin and clothing, use explosion-proof equipment and bonded containers to prevent static buildup
Storage: Store in cool, dry, well-ventilated area away from heat, sparks, open flames, strong oxidizers, acids or alkalis
Special Rules: Segregate from incompatible substances, control access to trained personnel, inspect containers regularly for leaks or deterioration
Engineering Controls: Local exhaust ventilation, process enclosures to limit vapor exposure, flameproof electrical installations
Protective Equipment: Chemical-resistant gloves, eye protection with side shields or face shield, flame-resistant clothing, full-face respirator for high vapor concentrations
Exposure Limits: ACGIH TLV for dicyclopentadiene is 0.5 ppm (skin), OSHA PEL not established, minimize exposure as much as possible
Workplace Practices: Wash hands after contact, never eat or drink near work area, remove contaminated clothing immediately
State: Liquid at room temperature
Color: Colorless to pale yellow
Odor: Pungent, camphor-like
Boiling Point: Around 170°C
Melting Point: Around 33°C
Vapor Pressure: Moderate at ambient temperature, increases with heat
Solubility: Insoluble in water, soluble in many organic solvents
Density: About 0.98 g/cm³
Flash Point: Approx. 35°C
Autoignition Temperature: About 400°C
Explosive Limits: Lower: 0.8%, Upper: 6.3% by volume in air
Chemical Stability: Stable under recommended storage conditions, can polymerize violently under heat or if contaminated
Reactive With: Strong oxidizers, acids, alkalis and peroxides
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, acrid smoke and toxic vapors on combustion
Polymerization Info: Heat, acids, peroxides and aluminum chloride can trigger rapid, hazardous polymerization
Acute Exposure: Inhalation causes coughing, headache, dizziness, narcosis at high concentrations, possible lung edema for severe cases
Skin and Eye Effects: Burns, redness, blistering, eye injury
Chronic Effects: Kidney and liver damage after repeated overexposure, neurotoxic effects documented in laboratory animals
Mutagenicity / Carcinogenicity: Not classified as a human carcinogen, not enough evidence for mutagenic effects in humans
Sensitization: Reports of allergic contact dermatitis in rare cases
Acute Ecotoxicity: Harmful to aquatic life, toxic to fish and some aquatic invertebrates, moderate persistence
Degradability: Slow to degrade in soil and water, risk of long-term accumulation in aquatic environments
Bioaccumulation: Potential exists for bioaccumulation in fish and other organisms
Mobility: Low water solubility, tends to volatilize from water or soil surfaces
Proper Methods: Incinerate in licensed chemical incinerator with afterburner and scrubber, don’t pour down the drain or into surface water
Regulatory Status: Classified as a hazardous waste under most national and international guidelines
Container Disposal: Triple rinse when empty, puncture drums, send for disposal as hazardous waste
UN Number: UN 2048
Proper Shipping Name: Dicyclopentadiene
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: III
Requirements: Keep away from heat, fire, store in upright, tightly closed, properly labeled containers according to transport regulations
Occupational Exposure Guidelines: Listed under chemical exposure limits in several jurisdictions
Environmental Rules: Releases require notification in some countries, strict limits on allowable discharges
Labeling Laws: Requires hazard warning, risk phrases for flammable, toxic substances, compliance with GHS standards for chemical safety data labeling
