Dimethyl phthalate is widely used as a plasticizer in the production of cellulose-based plastics, such as cellulose acetate and cellulose butyrate. It enhances the flexibility and durability of these materials, making them suitable for manufacturing films, fibers, and coatings. Additionally, it is employed in the formulation of personal care products, including perfumes and cosmetics, where it acts as a solvent and fixative to stabilize fragrances. In the industrial sector, it serves as a component in insect repellents, particularly for mosquitoes, due to its ability to deter insects effectively. Its solvent properties also make it useful in the production of adhesives, inks, and coatings, where it improves application and drying characteristics. High-purity grades are utilized as a chromatographic fixative in analytical chemistry.