Polyimides (PI) are high performance resins with high-heat resistance. They are amber to transparent in color and can compete with polyketones, polyarylates, and polysulfones in engineering applications. 

Being known for thermal stability, chemical resistance and mechanical properties, Polyimides are an excellent choice for dielectric and insulating films as well as mechanical parts. Polyimide film is the most common insulating material used for flexible circuits and electronic cable. Polyimides are also popular in aerospace where radiation resistance and heat resistance are required.