PTFE-coated steel plates. Most new bridges and tunnels use similar supports. Because of its exceptional chemical resistance over a wide temperature range, PTFE is used in a variety of seals, gaskets, packings and laboratory equipment. Its excellent electrical insulation properties and heat resistance lead to its use in high-temperature wire and cable insulation, molded electrical components, insulated transformers, hermetic seals for laminates for many electrical applications. Reinforced PTFE applications include bushings and seals in compressor hydraulic applications and pipe liners. A variety of moldings are used in aircraft and missiles and also in other applications where use at elevated temperatures is required.