Used as a crosslinking agent in high-performance polymers, particularly in polyimide and epoxy resin systems. Enhances thermal stability and mechanical strength of the resulting materials. Commonly applied in aerospace, electronics, and coatings industries where resistance to heat and chemicals is critical. Its anhydride groups react with amine or hydroxyl groups, enabling strong network formation in cured resins. Also utilized in specialty adhesives and insulating materials for electronic devices due to its low dielectric properties and reliability under extreme conditions.