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 [ ref. http://mmd.foxtail.com/archives/Digests/199803/1998.03.19.08.html 

Thanks for posting the article on this material on the Mechanical Music
Digest web page.  I found it while looking for the properties of Delrin
before using it for valves in a small steam engine.  Very informative;
it will save me a lot of what would probably have been wasted effort.

Jerry Brown