Used primarily as a plasticizer in polyvinyl chloride (PVC) and other polymers to improve flexibility, durability, and workability. It is favored in applications requiring good heat stability and resistance to extraction by oils or water. Commonly found in wire and cable insulation, automotive parts, and flexible films. Its branched alkyl chain structure provides lower volatility and better migration resistance compared to shorter-chain phthalates, making it suitable for long-life products. Also used in some adhesives, sealants, and flooring materials where enhanced performance under thermal stress is needed.