Trioctyl trimellitate is widely used as a plasticizer in the production of polyvinyl chloride (PVC) and other polymers. It enhances the flexibility, durability, and workability of plastic materials, making it suitable for applications such as wire and cable insulation, automotive parts, and synthetic leather. Its high thermal stability and resistance to extraction by water or oils make it ideal for use in environments with elevated temperatures or exposure to harsh conditions. Additionally, it is employed in the manufacture of adhesives, sealants, and coatings, where it improves performance and longevity. Its low volatility also ensures minimal loss during processing and extended service life of the final product.