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Name: Hexachlorocyclopentadiene
Chemical Formula: C5Cl6
Appearance: Oily, colorless to pale yellow liquid with a pungent odor
Common Uses: Ingredient in manufacturing pesticides, flame retardants, and specialty chemicals
Acute Risks: Causes severe eye and skin irritation. Can burn skin on contact, and vapor may irritate respiratory tract.
Chronic Effects: Repeated exposure raises liver and kidney risks; long-term inhalation or contact damages health over time.
Environmental Dangers: Extremely toxic to aquatic life, persistent in the environment.
NFPA Ratings: Health 3, Flammability 1, Reactivity 1
Single Substance: Hexachlorocyclopentadiene
Purity: Usually technical grade or above 98% purity for commercial supply
CAS Number: 77-47-4
Inhalation: Move victim outdoors, keep breathing fresh air, seek regular oxygen if symptoms linger.
Skin Contact: Rapid removal of contaminated clothing, wash with soap and large amounts of water for 15 minutes or more.
Eye Contact: Rinse eyes with water, keeping eyelids apart, and seek medical help if irritation continues.
Ingestion: Rinse mouth without swallowing, avoid forced vomiting, see a doctor right away.
Note for Practitioners: Watch for respiratory impact, check for chemical burns, offer supportive treatment
Suitable Extinguishing Media: Foam, dry chemical, or carbon dioxide offer reasonable suppression. Water spray less effective since the substance resists dissolving.
Special Hazards: Burning produces hydrogen chloride, phosgene, and other poisonous gases.
Firefighter Protection: Full gear and self-contained breathing equipment always stand between danger and rescue.
Explosion Risk: Container rupture possible from heat, though direct explosion unlikely unless exposed to high-intensity fire.
Personal Precautions: Don’t go near leaks without goggles, gloves, and respiratory masks. Keep unprotected people away.
Containment: Use absorbent material like sand; never flush down a drain.
Cleanup Method: Scoop up and seal residues in tight, labeled containers, ready for safe disposal.
Ventilation: Air out the space to chase off lingering fumes; open windows, run exhaust systems, and keep the place well-aired.
Handling: Pour and move containers carefully to dodge splashes or leaks. Avoid inhaling fumes, keep hands covered with gloves, and work under a hood if possible.
Storage: Store drums or bottles tightly sealed, protected from water, direct sunlight, and anything that could ignite. Designate chemical-specific storage away from acids, bases, or oxidizers.
Incompatible Materials: Strong bases, aluminum, and strong reducing agents threaten to cause runaway reactions.
Engineering Controls: Use exhaust fans, fume hoods, and other ventilation to keep air moving. Minimize vapor build-up.
Personal Protection: Wear goggles, face shields, neoprene gloves, and aprons. Choose a full-face respirator when vapors rise above safe limits.
Exposure Limits: OSHA and NIOSH recommend strict air limits; keep levels as low as possible, ideally under 0.01 ppm.
Boiling Point: Around 239°C (462°F)
Melting Point: Near -10°C (14°F)
Vapor Pressure: Low at room temperature, grows with heat
Solubility: Only slightly soluble in water, dissolves well in nonpolar solvents
Density: About 1.65 g/cm³
Odor: Noticeable, acrid scent
Chemical Stability: Remains steady in sealed, dry storage under normal conditions.
Reactive Risks: Attacks by strong bases, alkali metals, and heat spark hazardous decomposition; fumes and vapors increase at higher temperatures.
Decomposition: Generates hydrochloric acid, phosgene, and other harmful gases if burned or broken down by strong chemicals.
Acute Toxicity: High for inhalation and skin exposure. Short-term encounters with vapor can wreck airways and eyes; direct liquid contact can leave burns or blisters.
Long-Term Effects: Studies show liver and kidney harm after repeated exposure. Some animal research links this chemical to reproductive and developmental harm.
Routes of Exposure: Most danger from breathing vapor, skin contact, or accidental swallowing.
Symptoms: Cough, dizziness, sore throat, skin pain, and watery eyes signal exposure.
Aquatic Impact: Fatal to fish and water bugs at trace amounts. Danger lingers for years, piling up in mud and moving up the food chain.
Soil Effects: Moves slowly through soil, but small leaks can turn into long-lasting environmental headaches.
Degradation: Sunlight or microbes break it down only a bit; residues stick around in soil and water.
Requirements: Treat as hazardous waste. Outsource destruction to licensed chemical incinerators that destroy organochlorines at high heat.
Environmental Precaution: Dodge dumping in drains, sewers, or the natural world; one misstep ruins groundwater for generations.
Container Handling: Rinse drums or bottles under supervision, send them for safe destruction.
Classification: Transported as a hazardous material. Carriers and handlers must label, pack, and secure loads to keep scandals off roads, rails, and docks.
Precautionary Measures: Spill kits, leak-proof packaging, and clear documentation stay by every shipment.
Prohibition: Shipments block travel with food, feed, or public goods.
US and Global Rules: EPA lists as hazardous by RCRA, CERCLA, and TSCA. Generates reporting requirements if spilled beyond a strict threshold.
Workplace Safety: OSHA and international guidelines require routine air monitoring, spill response drills, and worker medical exams.
Labeling: Containers follow strict signal word, pictogram, and statement standards under GHS and national law.
