Teflon® is a registered trademark name for the material polytetrafluoroethylene (PTFE). This synthetic fluoropolymer is one of the most popular insulating compounds. PTFE can withstand extreme temperature fluctuations between -90 °C to 260 °C and is used in many challenging environments. It is also highly durable and exhibits excellent electrical properties.
In comparison to wires insulated through extrusion, PTFE insulated wire is tape-wrapped and therefore features a uniform thickness. For this reason, PTFE tends to be a higher-grade wire and is typically significantly more expensive than PVC insulated wire.