FWIW PTFE would be a poor choice for a rub strip. It'll work great, but it won't last very long & impacts will tend to reshape it (it cold flows under pressure). Similarly most Polyethylene variants would be a bad choice, for the same reason.
Acetal/Delrin/Celcon (pretty much all the same polymer) or Turcite (a very similar polymer) would be better choices for this. Can find it up on mcmaster.com Look for a impact acceptable version.
Another option, though not as easily found in the States, is something called "Jobrock" (sp?). Lola Race Cars uses it for rub strips under their race cars. Stuff wears great in that application.
Another option would be any of the High Strength Low Alloy steels that deal with impact OK (not all do). Core-10, Ten-X, T-1, AR, stuff like that. Pick an alloy and simply heavy tack-weld on a strip of it.
Last edited by ntsqd; 11-29-2007 at 11:36 PM.
I used to swerve around my hallucinations, now I drive right through them.