Starting in the late 1960s, BTDA found use in polyimide resins. BTDA-based polyimide films for electrical insulation, especially as substrates for flexible copper-clad laminates, are a crucial component of smart devices, including phones, tablet computers and Internet-of-Things componentry, as well as the growing network of 5G infrastructure.
Other polyimide applications utilizing BTDA include fibers for hot-gas filtration, foams for the thermal and acoustic insulation of military vessels, wire enamels and varnishes for electric motor assemblies, molding powders for industrial parts, and matrix resins for fiber-reinforced composites.
BTDA is available in a variety of particle types and purity levels. High-end polyimide and epoxy formulations use ultrapure grades of 99.8%+, while other applications use general-purpose 97-99% purity grades.