The commonly used abbreviation for polytetrafluoroethylene, a synthetic fluoropolymer prized for its exceptional non-stick properties, chemical inertness, and heat resistance. In food contexts it is best known as the coating on non-stick cookware, bakeware, and industrial food-processing surfaces, where it prevents sticking, eases cleaning, and reduces the need for added fats. The coating is stable at normal cooking temperatures but degrades if severely overheated, so manufacturers advise against empty preheating and high-heat searing on coated pans. Food-contact grades must comply with migration limits set by regulators for materials touching food.