Mail Archives: geda-user/2017/02/16/09:12:21
--Apple-Mail=_6DB00A66-D7E0-450C-A910-443497A7B587
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
charset=windows-1252
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
--Apple-Mail=_6DB00A66-D7E0-450C-A910-443497A7B587
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
filename=signature.asc
Content-Type: application/pgp-signature;
name=signature.asc
Content-Description: Message signed with OpenPGP using GPGMail
-----BEGIN PGP SIGNATURE-----
Comment: GPGTools - https://gpgtools.org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=emwp
-----END PGP SIGNATURE-----
--Apple-Mail=_6DB00A66-D7E0-450C-A910-443497A7B587--
- Raw text -