Ross Herbert wrote in message
...
On Mon, 3 Mar 2008 08:07:40 -0000, "N Cook" wrote:
SNIP
:
:
:But that is also nylon, just because they call it high temperature, does
not
:necessarily mean it does not compress/creep in normal but highly elevated
:temperatures, leading to premature failure of device.
:The point is I'm after some insulated and mechanically strong enough
:alternative to plastic without having to drill into heatsinks for spring
:retention.


Not all nylons are the same as you know. The normal nylon 6/6 from which
the
ordinary items are made should not be used over 49C but the items I
mentioned
are designed to operate up to 200C.

If you did some research on the material Polyphenylene Sulfide from which
the
Richco product is made you would find the following;

.. Plastic parts for SMD components are made of PPS (Polyphenylene
sulfide)
.. which is a high temperature material suitable for reflow soldering
profiling.
.. Temperature of operation: 200 ..C
.. Flammability conformance : As per UL 94 V-O

The point of this thread is not the ultimate melting temperature but the
property of not creeping/deforming at sustained elevated temps of say 100 to
120 deg C.
eg PTFE would be fine for the internal sleeve part of such bushes unless
having to resist abnormal lateral forces. But it would it be reliable as the
washer part.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/