Ahh but I belive that you stated in your original post to plate everthing in PFTE. So I was confused. The only area of application of PFTE would be fuel tanks.
And Injectors. And any other surface coming into contact with corrosives under 600 C/870 K.
PTFE melts at 599K (326 degrees C), not 600 degrees C. Also that number is irrelevant because it starts to break down into fluorocarbon gases at 533K, so unless your PTFE object is only expected to last a few minutes at best the breakdown temperature is the working limit.
We dig deep down into the very building blocks of life, seeking to twist them to our will. We destroy mass itself to turn its energy to our ends. The speed and intelligence of our machines grows without bound. But even the power of gods isn't enough. Ever hungry, we turn our eyes to the stars...
I sure hope there's someone else more advanced out there. If we're the first, the universe is screwed.