Used in the synthesis of high-performance polymers and resins, particularly in the production of polyimides and polyesters that exhibit excellent thermal stability and mechanical strength. Commonly applied in coatings, adhesives, and electronic materials due to its ability to enhance heat resistance and chemical durability. Also serves as an intermediate in the manufacture of specialty chemicals, including dyes and plasticizers. Its anhydride functionality allows for efficient crosslinking in thermosetting systems, making it valuable in composite materials and encapsulants.