Bis(2-butoxyethyl) phthalate is primarily used as a plasticizer in the production of flexible PVC products. It enhances the flexibility, durability, and workability of materials such as vinyl flooring, wire and cable insulation, and synthetic leather. Additionally, it finds application in coatings and adhesives, where it improves the film-forming properties and adhesion strength. In the cosmetics industry, it is sometimes used as a solvent or stabilizer in formulations like nail polishes and hair sprays. Its ability to dissolve various resins and polymers also makes it useful in specialty inks and paints.