Cyclopentene CAS 142-29-0

1. Cyclopentene is primarily used as a comonomer in the production of synthetic rubber and specialty plastics, enhancing elasticity and heat resistance, particularly in high-performance tires . It serves as a critical raw material in the polymer industry for synthesizing materials like poly(cyclopentene) rubber and specialty elastomers .
2. Cyclopentene CAS 142-29-0 functions as a versatile intermediate in organic synthesis for pharmaceuticals, including the synthesis of prostaglandin analogs and antiviral medications, as well as for producing agrochemicals, dyestuffs, and other specialty chemicals .
3. Applications of Cyclopentene also include its use as a resin cross-linking agent, as a building block for fine chemicals such as cyclopentanol derivatives, and as a chemical intermediate in research laboratories for various organic transformations .

1. Store Cyclopentene in a tightly sealed container in a cool, dry, and well-ventilated area, away from heat, sparks, and all ignition sources. Recommended storage temperatures range from 0-6°C to refrigeration (0-10°C) to prevent polymerization and vapor accumulation . The compound is air-sensitive and should be protected from prolonged exposure to air .
2. Keep Cyclopentene strictly away from strong oxidizing agents, acids, and halogenated hydrocarbons due to incompatibility and risk of violent reactions or polymerization . Grounding and bonding of containers is required to prevent electrostatic discharge.
3. Always use appropriate personal protective equipment (PPE) including chemical-resistant gloves (rubber), tightly fitting safety goggles with a faceshield, and fire-resistant or anti-static protective clothing. Handle only with adequate ventilation or in a fume hood, and use explosion-proof equipment to prevent ignition .

1. Immediately isolate the spill area (at least 50 meters/150 feet in all directions), eliminate all ignition sources, and evacuate non-essential personnel. Contain Cyclopentene using dry, inert, non-combustible absorbent material (e.g., dry sand or universal binder) and prevent entry into drains or waterways .
2. Carefully collect Cyclopentene CAS 142-29-0 using non-sparking, explosion-proof tools into sealed, labeled chemical waste containers for proper disposal according to local, state, and federal environmental regulations. For small spills, use active charcoal or other inert material for absorption; for large spills, dike far ahead of the liquid and cover with foam to suppress vapors .
3. Personnel must wear full chemical-protective equipment including self-contained breathing apparatus (SCBA) during cleanup. Cyclopentene is classified for transport (UN2246, Hazard Class 3, PG II) and requires hazardous waste disposal. Water spray may reduce vapors but may not prevent ignition in closed spaces .

1. Cyclopentene is classified as a highly flammable liquid and vapor (H225, Danger) with a flash point ranging from -30°F to -29°C (-20°F), and may form explosive mixtures with air (LEL 1.5%, UEL 12.1%) . Vapors are heavier than air and may travel considerable distance to a source of ignition and flashback .
2. Cyclopentene is harmful if swallowed, inhaled, or absorbed through the skin (LD50 oral rat: 1656 mg/kg; dermal rabbit: 1231-1590 uL/kg) . Cyclopentene CAS 142-29-0 causes skin irritation (H315) and serious eye irritation (H319), and may cause drowsiness or dizziness (H336) and aspiration hazard if swallowed (H304, may be fatal if swallowed and enters airways) .
3. Cyclopentene is stable under normal conditions but may polymerize in the presence of catalysts or initiators . It is insoluble in water, harmful to aquatic life (H411/H412) , and thermal decomposition produces toxic fumes including carbon monoxide. Always consult the specific Safety Data Sheet (SDS) for Cyclopentene for complete hazard information, first-aid procedures (P303+P361+P353 for skin, P305+P351+P338 for eyes, P301+P310 for ingestion), and handling instructions.