Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene with numerous applications. The best known brand name of PTFE-based formulas is Teflon by DuPont, which discovered the compound. It is a strong, tough, waxy, and nonflammable synthetic resin produced by the polymerization of tetrafluoroethylene. PTFE is distinguished by its slippery surface, high melting point, and resistance to attack by almost all chemicals. It is used in a variety of products, including vascular grafts used to bypass obstructed blood vessels and grafts used for dialysis access.