Isoprene is primarily used in the production of synthetic rubber, especially polyisoprene rubber, which closely mimics natural rubber in elasticity and durability. It is a key monomer in manufacturing tires for automobiles, where high resilience and abrasion resistance are required. Isoprene-based rubbers are also used in mechanical goods such as hoses, belts, and seals due to their excellent fatigue resistance. Additionally, copolymers of isoprene, like butyl rubber, are used in inner tubes and tire liners because of their low gas permeability. The chemical also serves as a building block in the synthesis of specialty polymers and elastomers used in adhesives, footwear, and medical devices. In smaller quantities, isoprene is involved in the production of terpenes and other fragrance compounds in the chemical industry.