On Wed, 13 Feb 2008 22:17:35 -0800 (PST), npwbill
wrote:

I note there's a lot of general knowledge out there in this group and
I have hopes that someone is familiar with plastics to make some
suggestions. I've cross posted to one other group.

I'm not familiar with what all is available today in the plastic/
polymer field. What two plastics, choosing, say, PVC, Polyethylene,
UHMW, ABS, and so on, are the slickest, or will wear well against ONE
ANOTHER?

I'm using a 2" UHMW piston in a PVC cylinder and the wear seems to be
OK, but I really feel there's something better and probably "slicker"
against one another out there than what I'm using now...

Teflon is pretty prohibitive for cost, I do know that...

Any ideas or experience out there?

Thanks in advance...

Bill

I think you'll have to experiment. Teflon may not be the answer. As
an aside, I once visited K2 (ski maker) on Vashon Island near Seattle
on business. I asked about Teflon for the running surface, and was
told they had tried it, thought it would be great, but it didn't run
nearly as well as UHMW.

That was a beatiful facility, by the way. The VP of R&D we were
visiting with was dressed in jeans, polo shirt, and sneakers, and had
the help loading up the van for a run up the mountain for some field
tests. What a gig.

Pete Keillor