On Wed, 19 Mar 2008 07:06:43 -0700 (PDT), eric h
wrote:

On Mar 18, 10:14 am, Ned Simmons wrote:
On Tue, 18 Mar 2008 06:45:40 -0700 (PDT), eric h

wrote:

The only problem with what you're suggesting, Roger, is that the
plastic won't beUHMWwhen it cools.

UHMWrequires heat and pressure to form. Heating it without pressure
turns it into something different ( not sure WHAT it is, but it's not
UHMW.)

I've been working withUHMWfor 25 years and have never heard this. Do
you have a source?

http://www.garlandmfg.com/plastics/h...mingparts.html

--
Ned Simmons

I don't have a source for it, ned, but I do remember reading it - I
believe it has something to do with the difficulties you encounter
when UHMW is extruded.

I did experiment with UHMW myself to find out more about what I was
selling (I sell it on ebay as surplusdealdude), and I do remember
weighing a piece, heating it up and re-weighing it after it had been
pressed and cooled. It weighed less afterwards.

I worked for a company that had the capability of injection molding
UHMW. Lots of folks said it couldn't be UHMW but a major chemical
company that makes the resin tested it and said it had all the
properties of UHMW. If it looks like a duck and quacks like a duck
.......