It is totally possible that different companies will have slightly different charts but usually they're about the same. The canonical way to know if to ask the

It is totally possible that different companies will have slightly different charts but usually they're about the same. The canonical way to know if to ask the manufacturer of the actual plastic you're using, these comprehensive tables are usually put out by distributors as general guidance. I'm not surprised that some plastics may not be based on temperature only. For instance, nylon might crack if it's a thin piece due to thermal expansion. Or some may chemically react with steam. I agree that it's weird that PCL would be okay while Teflon isn't, but it could be a molecular weight or thermal cycling thing. Teflon is very soft already so it might simply get deformed. I'd trust such a table to point me in the right direction but find a second independent source if the answer seems weird. Of course in practice you just try it and see if it survives and is functional. lots of plastics can survive a cycle or three but not five.