Monoisopropyl phthalate is primarily used as a plasticizer in various industrial applications. It helps improve the flexibility and durability of plastics, making it valuable in the production of PVC products such as cables, flooring, and synthetic leather. Additionally, it serves as an intermediate in the synthesis of other chemical compounds, particularly in the manufacture of specialty chemicals and coatings. Its compatibility with polymers makes it suitable for use in adhesives and sealants, enhancing their performance and longevity. In the cosmetics industry, it is sometimes utilized as a solvent or stabilizer in formulations, contributing to the texture and stability of personal care products.