Diisobutyl fumarate is widely used as a plasticizer in the production of polymers, particularly in PVC and other vinyl resins. It enhances flexibility, durability, and workability of the materials, making them suitable for applications in coatings, adhesives, and sealants. Additionally, it is employed in the formulation of inks and paints, where it acts as a solvent and improves the flow and drying properties. In the personal care industry, it is utilized in cosmetics and skincare products as an emollient, providing a smooth texture and enhancing skin feel. Its compatibility with various chemicals and stability under different conditions make it a versatile ingredient in industrial and consumer applications.