UHMW Polyethylene

[John King]

I have a couple of sheets (0.5" x 12" x 12") ultra high molecular weight (UHMW) polyethylene that have warped/twisted. They are no longer suitable for making jigs because they do not lay flat.

Any ideas/thoughts on how to flatten the sheets? - John

[Dick Strauss]

John,
It is kind of complicated but they do have a brief description on wiki in the "annealing" sub-section... http://en.wikipedia.org/wiki/UHMW

[Richard Madison]

Well, that's a bit more complex (and much higher temperature) than I thought (ref. post in other forum). Good luck.