Dicyclopentadiene (DCPD) is a highly reactive hydrocarbon compound with the chemical formula C₁₀H₁₂, commonly used as a key intermediate in the production of resins, plastics, and specialty chemicals. It is a dimer of cyclopentadiene, formed through a Diels-Alder reaction, and appears as a colorless to pale yellow liquid with a pungent odor. DCPD is widely utilized in the manufacture of unsaturated polyester resins, hydrocarbon resins, EPDM rubber, and flame retardants. Its excellent reactivity and thermal stability make it valuable in applications ranging from automotive parts and construction materials to adhesives and coatings. Due to its flammable nature and potential health hazards, DCPD must be handled with appropriate safety precautions.