Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer that has numerous applications. The best known brand name of PTFE-based formulas is Teflon by DuPont, which discovered the compound in 1938 and is used as non-stick coating for pans and other cookware, and often used in containers and pipework for reactive and corrosive chemicals. It is also used as a lubricant to reduce friction and energy consumption of machinery. PTFE is hydrophobic where neither water nor water-containing substances wet it. PTFE has one of the lowest coefficients of friction of any solid. Using PTFE as insulator material makes it thermally stable and chemically resistant, and unaffected by sunlight, moisture and virtually all chemicals. The insulator material must be chosen properly in order to have the lowest possible return loss. The insulation between inner and outer conductor is the dielectric. It significantly influences the electrical characteristics such as impedance and capacitance. It also reduces the possibility of shorting out during operation at high voltage. Amphenol RF has a large selection of extended dielectric connectors using PTFE.