[time-nuts] HP Z3801 melted rubber feet. Heads up

[Pete Lancashire]

When at GE aerospace one of the departments near me spent a lot of money
analyzing what accelorated reversion. I wish I still had one of the report
that listed the usual scientific reasons such temp, ozone, etc etc .. but
one had a reference to I think included  sun spots and the temp at
Stonehedge

You take 100 samples from the same batch, and one we go to go and the other
99 will not.




On Fri, Jul 26, 2013 at 4:54 PM, Joseph Gwinn <joegwinn at comcast.net> wrote:

> time-nuts Digest, Vol 108, Issue 135
>
> On Fri, 26 Jul 2013 18:58:26 -0400, time-nuts-request at febo.com wrote:
> > Message: 5
> > Date: Fri, 26 Jul 2013 18:58:14 -0400
> > From: paul swed <paulswedb at gmail.com>
> > To: paul swed <paulswedb at gmail.com>, Time-nuts <time-nuts at febo.com>
> > Subject: [time-nuts] HP Z3801 melted rubber feet. Heads up
> > Message-ID:
> >       <
> CAD2JfAhN4H8Ldzh0SYWLf-DC3UoT7WfP0dwnMJneT44r1NnZ4Q at mail.gmail.com>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > Beginning the process of installing a hp 10544 in what had held the Hp
> > 10811 temporarily by adding some wires for power to the 10544. Pulled the
> > main board out and what a mess I discovered. HP installed some rubber
> feet
> > to support the main boards and they have melted and turned to gue. Whats
> > interesting is the stuff ran all over the mainboard. Like it wicked
> upward.
> > Can't be good and no idea if the stuff actually has conductivity to some
> > level in this state. Seems to clean up well with rubbing alcohol. But
> will
> > be a job and many cotton swabs will give their life in the process.
> > Maybe the stuff is alive.
>
> Sounds like the feet were made of a polyurethane rubber.  Polyurethane
> rubber and foam can spontaneously depolymerize, reverting to the goo
> from whence it came.  High temperature and humidity speed things
> along.  Google for "urethane reversion" (omit the quotes).
>
> Joe Gwinn
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