Polytetrafluoroethylene can only withstand the high temperature of 200~300 degrees Celsius, because it is a polymer material that is easy to produce harmful substances at high temperature, while ceramics can withstand the high temperature of up to 450 degrees without producing harmful substances.
However, from a health point of view: non-stick pan is not as healthy as iron pan. Experts from the World Health Organization also advise people to choose safe and healthy China iron pots.