The problem we have with silicone rubber in upstate NY is
that wasps attack it. When they get done you have a pile of
little rubber granules on the ground below and none where
you originally put it.

Allen

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of RussellMc
> Sent: Thursday, May 30, 2013 8:15 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Solar powered Arduino
>=20
> NB: I love silicone rubber.
> I think its marvellous stuff as long as it is not used
outside it's
> "performance envelope".
>=20
> ________________
>=20
> > The setup works fine. There are 32 of them in use for
over
> 5 years at 4
> > dairy farms, no corrosion, no moisture issues and the
area
> goes through
> > freeze and thaw issues all the time.
>=20
> Anything that has worked well for you for 5 years sounds
> like it is
> suited to the task :-).
>=20
> Some other task it may fail at. As long as none of those
are
> ever your
> ones you are doing well :-).
>=20
> It did not say (AFAICS) on the page that you cited that it
was
> neutral
> cure so I assume it wa sacetic cure - but maybe not. If so
> that is
> enough to cause equipment fatalities in some contexts -
and
> none at
> all in others.
>=20
> > The ones installed use wifi and
> > solar to relay farm information.
>=20
> > Silicone works fine as a sealant, I
> > use the GE silicone.  I inspected one of the first
series a
> month or so
> > ago because of a charging issue and all was fine except
the
> battery
> > needed changing out.
>=20
> "Works fine" is good. But, it's still not water vapor
proof.
> Humidity
> inside a si rubber sealed box or blob will track ambient
with a
> modest
> delay. As long as it bonds void free to surfaces it will
keep
> the
> liquid water down tp the %-solubility in the SR concerned.
> Which
> varies with product.
>=20
> > The setup is not under water, and at a depth of 2
> > feet the pressure isn't a concern.
>=20
> Above the water table is good :-).
> Some sealants would allow use with net hydrostatic
external
> pressure
> and liquid present.  Long term SR tends not to be one of
> these.
>=20
> > The silicone used is this:
> > http://www.grainger.com/Grainger/GE-Window-and-
> Door-Sealant-4UH03
>=20
> As above - it it works for you its excellent. Others *MAY*
> find that
> in cases that seem similar it fails badly because some
critical
> but
> inobvious line as been crossed over.
>=20
>=20
>=20
> >
> > Mark
> >
> > --
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