PTFE, polytetrafluoroethylene, is a unique type of high temperature film used to make high temperature tape.  First discovered in 1938 by a researcher at DuPont Research Labs in New Jersey, this film is flexible, will withstand high temperatures and has a high dielectric strength.  It was first marketed in 1945 by Dupont under the registered trademark Teflon.  Many companies can make PTFE , but only DuPont can make Teflon. 

Today, Teflon and PTFE are used interchangeably however DuPont works hard to protect its trademark.  

IPTFE tapes are made a number of different ways, each with its own unique characteristics.  Extruded PTFE, skived PTFE and high modulus PTFE tapes are commonly used in high temp electrical applications.