This is spill over from the Boundless Tera thread. I don't wish to start anything, but to learn and understand. How safe is PTFE when used it a vaporizer when used like below: From Eric@Boundless: After discussing with our manufacturer and expressing the concerns of the original heater, it was decided to remove the rock wool insulation and thermal tape completely. We decided to move forward with PTFE, Teflon, film to use as an insulator on the outer ceramic core and also as a thin buffer for the internal heating rod. Note: The Tera can hit 500F in concentrate mode. From Wikipedia: Pyrolysis of PTFE is detectable at 200 °C (392 °F), and it evolves several fluorocarbon gases and a sublimate. An animal study conducted in 1955 concluded that it is unlikely that these products would be generated in amounts significant to health at temperatures below 250 °C (482 °F). 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). The degradation by-products can be lethal to birds, and can cause flu-like symptoms in humans—see polymer fume fever. Meat is usually fried between 204 and 232 °C (399 and 450 °F), and most oils start to smoke before a temperature of 260 °C (500 °F) is reached, but there are at least two cooking oils (refined safflower oil at 265 °C (510 °F) and avocado oil at 271 °C (520 °F)) that have a higher smoke point.