Dimethyl phthalate is widely used as a plasticizer in the production of cellulose-based plastics, such as cellulose acetate and cellulose nitrate. It enhances the flexibility and durability of these materials, making them suitable for applications in films, coatings, and molded products. Additionally, it is employed in the manufacturing of lacquers, varnishes, and enamels to improve their workability and finish. In the personal care industry, it serves as a solvent and fixative in perfumes and cosmetics, helping to stabilize fragrances and extend their longevity. Dimethyl phthalate also finds use as an insect repellent, particularly against mosquitoes and other biting insects, making it a common ingredient in topical repellent formulations. Its effectiveness in this role has led to its inclusion in various consumer products designed for outdoor use.