Teflon PFA, the products of this material are generally referred to as "non-stick coating"/"easy to clean wok material"; it is a synthetic polymer material that uses fluorine to replace all hydrogen atoms in polyethylene. This material has the characteristics of acid and alkali resistance, resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, Teflon PFA has the characteristics of high temperature resistance, and its friction coefficient is extremely low, so it can be used for lubrication, and it has also become an ideal coating for non-stick pans and water pipes.
Teflon PFA is widely used in a variety of occasions requiring resistance to acids, alkalis and organic solvents, and is used to make non-stick pans and dry-type transformers. Teflon PFA has a soft texture and is therefore often used in coatings. When it was first developed, its main application area was the inner wall coating of high-temperature launch rockets. Teflon PFA is also a major component of the green tape.
Teflon PFA is non-toxic under normal conditions, but Teflon PFA cookware begins to deteriorate after reaching a temperature of 500°F (260°C) and begins to decompose above 660°F (350°C). DuPont states in "What to Know About Cookware with DuPont Teflon Nonstick Coatings" that inert Teflon PFA undergoes chemical changes at temperatures up to 260°C.
By comparison, when cooking oils, fats and creams, temperatures reaching about 392°F (200°C) will produce scorch and smoke, while meat typically scorches between 400°F–450°F (200°C–230°C) , however, if an empty cooking utensil is placed on the fire, it is easy to exceed this temperature inadvertently.