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

paul swed paulswedb at gmail.com
Fri Jul 26 21:54:50 EDT 2013


Reversion or not the goo is gone.. Plastic scraper for major stuff. Toilet
paper to clean off the goo. It adheres to the goo really well. Good dose of
alcohol and some qtips for the tight places. The boards and case are clean
and not sticky. Back to integrating a 10544 oven in.
Regards
Paul.


On Fri, Jul 26, 2013 at 8:24 PM, Pete Lancashire <pete at petelancashire.com>wrote:

> 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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