Here is basic information about PTFE coating;
The U.S. Food and Drug Administration (FDA) concluded that fluoropolymer non-stick coating for cookware is acceptable for conventional kitchen use. Heating non-stick cookware above 500°F (260°C) can discolor the surface of the cookware or cause it to lose some of its non-stick properties. Since butter, fats and cooking oils start to smoke at 400°F (204°C), overcooked foods would most likely burn to an inedible state before the non-stick coating would be affected. If an empty non-stick cookware pan is accidentally heated above 660°F (348°C), a temperature that far exceeds what food preparation calls for, the non-stick coating may begin to deteriorate. The coating will not melt within the ingredients even if the coating is accidentally ingested, it is non-toxic and would pass through the body without being absorbed. Based on the inert characteristics of the coating, data indicates that there are no health effects from the incidental ingestion of pieces of non-stick coating. Our highest cooking temperature is 212°F. It is safe to use. Although Non-stick coating is very sensitive, please use with extra caution.
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