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Subject: Re: [geda-user] [Offtopic] Application of silicone based conformal coatings?
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From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <CAOuGh89ZD1DbEUM7WV7bvYxiNNHCxCjseAtzcHEtoHWgp0t2XA@mail.gmail.com>
Date: Thu, 16 Feb 2017 07:10:21 -0700
Message-Id: <D69A69EB-078B-4678-B11A-B12881333905@noqsi.com>
References: <CAJXU7q95PkktJM9=16dT4i3WvjyxZUm8a6-R1=2aicSVy=RJSA AT mail DOT gmail DOT com> <CAJXU7q_qiMXcZcOzFveqsZgCxoAXi+B7xH4GEk2KSwHet=xp=A AT mail DOT gmail DOT com> <CAJXU7q--N29TOf5+ig_5YisyNW3F62odKpdDwXemVaLy2Wiq_A AT mail DOT gmail DOT com> <CAJXU7q-4-+hyXJF-q0C641HTY5bVjb4mnfF1=xyGp_A72G_=KA AT mail DOT gmail DOT com> <CAJXU7q9dXwevyC=TjRE6AUHBQz-S8RUvoORE_z1XwJX1AgBB3w AT mail DOT gmail DOT com> <CAJXU7q-hx53oEQAgpHmf49Ver7hPuORbTQ-K3SdeQpgqt4b7Kw AT mail DOT gmail DOT com> <CAJXU7q9gJZ5ANHXyZHuv6X_qp4hp_gem8Na7bSkdEaOuPOiiJw AT mail DOT gmail DOT com> <CAJXU7q_uPzLnLNoKimgvqwuJAN4kuf+i12p3e71Mi2gHhpZi1g AT mail DOT gmail DOT com> <CAJXU7q_5hrM6-zwX3cEyoDRT33+WGdhSxO-P4ufXA6S-Nc5cgA AT mail DOT gmail DOT com> <CAJXU7q8ty5v7mQYe0i1rPoUWy010c+iPwrYaMoDzMQzRXWUcpg AT mail DOT gmail DOT com> <CAJXU7q_XmFbjP4qpXOW5bVom2iOv9nc_uFegQ9uPefkAzabVEA AT mail DOT gmail DOT com> <CAJXU7q_DyHt1=Bv3W8va-e1ihJRtqvYNCKcsfUs9rdDm4zju-w AT mail DOT gmail DOT com> <CAJXU7q88UX_Tz4TLxfgPwCz9GkhTJCdWbWjxD-DRXoM_T=s3ow AT mail DOT gmail DOT com> <CAJXU7q88jHup0uTXboes_xk7zP6AgNf5eOZD5RFQZx3JiA329A AT mail DOT gmail DOT com> <CAJXU7q98B!
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On Feb 16, 2017, at 6:37 AM, Bob Paddock (graceindustries AT gmail DOT com) =
[via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:

> On Thu, Feb 16, 2017 at 4:38 AM, Peter Clifton
> (petercjclifton AT googlemail DOT com) [via geda-user AT delorie DOT com]
> <geda-user AT delorie DOT com> wrote:
>> Hi all,
>>=20
>> I bought some Dow Corning silicone based conformal coating
>=20
>=20
> Do you have access to a clean paint spray gun?
> Preferably driven by an oil free air stream,
>=20
> There is some discussion of coatings in December 2008 of the old list =
archives,
> where I wrote this, which is worth repeating:
>=20
>=20
>   "A very common misconception is that Conformal Coating is a Hermetic
>   Seal.    It is used a lot in the Coal Mines, and the Electronic =
Industry in
>   general,   to keep the caustic dust off circuit boards.
>=20
>   As Conformal Coating is not a hermetic seal, what real happens is =
the
>   impurities in the water are kept away from the circuit, but the =
water
>   itself reaches the traces [eventually]. Since the water is now
> fairly devoid of
>   contaminates the water acts more like a dielectric insulator. You
>   never notice it in a low impedance digital circuit, but unless
>   debugging is an obsession don't let it get near a RF tuning circuit =
or
>   a high impedance circuit.=94

Well, there=92s parylene, which stops pretty much everything, but you =
need specialized facilities to deposit it.

>=20
> http://archives.seul.org/geda/user/Dec-2008/msg00324.html
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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