不完全。单单PTEF（不考虑PFOA），它在500华氏度以上也可能产生对人体不适的物质。

出处：http://en.wikipedia.org/wiki/Polytetrafluoroethylene


While PTFE is stable and nontoxic at lower temperatures, it begins to deteriorate after the temperature of cookware reaches about 260 °C (500 °F), and decomposes above 350 °C (662 °F).^[26] These degradation by-products can be lethal to birds, and can cause flu-like symptoms in humans.^[26] In May, 2003, the environmental research and advocacy organization Environmental Working Group filed a 14-page brief with the U.S. Consumer Product Safety Commission petitioning for a rule requiring that cookware and heated appliances bearing non-stick coatings carry a label warning of hazards to people and to birds.^[27]

Meat is usually fried between 204 and 232 °C (399 and 450 °F), and most oils will start to smoke before a temperature of 260 °C (500 °F) is reached, but there are at least two cooking oils (refined safflower oil and avocado oil) that have a higher smoke point than 260 °C (500 °F). Empty cookware can also exceed this temperature upon heating.