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Polyimide, also known as PI, has been mass-produced since 1955.
-	It is a thermoplastic or thermoset polycondensate.
-	Applications: PI is commonly 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.