" fired this volley in news:4a3aa825-
:

My first thought was teflon, but I think a better choice would be
UHMW

Ultra high molecular weight WHAT? You mean, "Polyethylene"?

For lubricity, you might want to use extreme-temperature PTFE. Weird stuff
to cut, but it wears almost forever in a metal bore, and produces about
1/10th the friction coefficient of UHMW-PE.

LLoyd