Interesting. The breaks-down-at-250C idea comes from the safety info,
which more-or-less says that it does. I feel an (open air, upwind)
experiment coming on...
The 1% expansion at 65F (what's that? 17 C?) doesn't seem to hit us
when we use it. Though our extruder is exuding a tiny amount of CAPA
down it's screw thread between the PTFE and the brass. Interestingly
it comes out dark green, which reminds me about all that stuff on not
mixing CAPA with copper...
But it doesn't seem to stop the thing working in any way.
Yours
Adrian
[
staff.bath.ac.uk]
[
reprap.org]
Quoting Forrest Higgs :
> Some things I certainly didn't know about PTFE.
>
> First,
>
> "PTFE resins have an
> unusual thermal expansion characteristic. A transition at 65
