Dipropyl phthalate is primarily used as a plasticizer in the production of flexible plastics. It helps improve the flexibility, durability, and workability of materials like polyvinyl chloride (PVC). This chemical is also employed in the manufacturing of adhesives, sealants, and coatings, where it enhances performance by providing better adhesion and elasticity. Additionally, it finds application in the cosmetics industry as a solvent or stabilizer in various personal care products. Its ability to dissolve and stabilize other substances makes it useful in industrial formulations where consistent texture and longevity are required.