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, coatings, and molded products. Additionally, it serves as a solvent in various industrial applications, including the production of adhesives, inks, and resins, where it helps in dissolving and blending components effectively.

In the personal care and cosmetics industry, it is utilized as a fixative in perfumes and fragrances, helping to stabilize and prolong the scent. Its ability to blend well with other ingredients makes it a valuable component in lotions, creams, and other cosmetic formulations.

Dimethyl phthalate also finds application as an insect repellent, particularly against mosquitoes and other biting insects. It is often incorporated into lotions, sprays, and wearable devices to provide protection against insect-borne diseases.

In the pharmaceutical sector, it is used as a coating agent for tablets and capsules, ensuring controlled release and protection of active ingredients. Its compatibility with various pharmaceutical excipients makes it a reliable choice for drug formulation.