Bis(trans-3,3,5-trimethylcyclohexyl) phthalate is primarily used as a plasticizer in the production of flexible polyvinyl chloride (PVC) materials. It enhances the flexibility, durability, and workability of PVC, making it suitable for applications such as flooring, cables, and synthetic leather. Its stability at high temperatures and resistance to extraction by oils and solvents make it ideal for use in automotive interiors and industrial hoses. Additionally, it is employed in coatings and adhesives to improve their performance and longevity. The compound’s compatibility with various polymers also allows for its use in specialized applications requiring low volatility and high efficiency.