Polyimide, also known as PI, has been mass-produced since 1955.
-	It is a thermoplastic or thermoset polycondensate.
-	Applications: Used in bearing materials, thrust washers, and semiconductor wafer clamps.
-	General properties: It has high impact and dielectric strength, high heat resistance (260 ºC continuous, up to 480 ºC intermittent), and a low coefficient of thermal expansion.
-	Trade Name: Vespel, Kapton.