Dioctyl phthalate is widely used as a plasticizer in the production of flexible polyvinyl chloride (PVC) products. It enhances the flexibility, durability, and workability of PVC, making it suitable for applications such as cables, flooring, synthetic leather, and medical devices like blood bags and tubing. Additionally, it is employed in the manufacturing of adhesives, sealants, and inks, where it improves performance and stability. Its compatibility with various polymers also makes it useful in coatings and paints, providing smooth finishes and enhanced adhesion. However, its use is being phased out in certain applications due to environmental and health concerns.