PEN film is an insulating film of insulation class F. Teonex is a brand for PEN insulating films.

Kaladex is a brand name for a PEN insulating film. Kaladex PEN is a biaxially oriented film whose performance and cost are between those of PET polyester and polyimide films. Kaladex® offers high rigidity and mechanical strength, low heat shrinkage and excellent dielectric strength, hydrolysis and chemical resistance.