Many applications for DuPont™ Kapton® * brand Polyimide film are based on the fact that the excellent electrical properties for Kapton, such as dielectric strength and dissipation factor, remain nearly constant over a wide range of temperatures and frequencies. Others make use of the film’s radiation resistance or chemical resistance at elevated temperatures.
Because Kapton type H has no melting point. Dupont combines Teflon ** Fep-fluorocarbon resin with the polyimide to produce DuPont™ Kapton® * brand Polyimide type F. The primary purpose of the Teflon Fep is to provide a heat-sealable surface on the tough non-melting polyimide base film (i.e. DuPont KaptonÒ * brand Polyimide type F may be heat bonded to itself without the use of adhesives – the resulting insulation behaves more like a film than a wrap). In addition, the coating of Teflon Fep improves the chemical resistance of the composite film, especially to bases and concentrated acids and reduces the rate of moisture permeability and oxidative decomposition. In almost all cases, this combination of DuPont KaptonÒ * brand Polyimide type H with Teflon Fep gives a film whose properties are arithmetic averages of the two components.
Applications for DuPont™ Kapton® * brand Polyimide type F are based on the excellent high temperature electrical and mechanical properties of thin gauge Kapton type H plus the complete seal, moisture protection and flexibility imparted by the DuPont™ Kapton® * brand Polyimide Fep.
* Kapton® is a registered trademark of the DuPont™ Company.