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From: "Peter Clifton (petercjclifton AT googlemail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Thu, 16 Feb 2017 13:52:59 +0000
Message-ID: <CAJXU7q_aqBYYS5mba=TiwpyCrN6SFnbYzcWh024Jyo8tcTNN7g@mail.gmail.com>
Subject: Re: [geda-user] [Offtopic] Application of silicone based conformal coatings?
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Thanks guys.

Might have a spray gun. Truly clean air is less easy, but I've got a rotary
vane compressor (Hydrovane).

Think the stuff is too thick to spray without diluting. Data sheet suggests
xylene, which potentiality raises safety issues... not sure quite what I
can did here.

Might be best to get some quotes for commercial application  (otherwise we
will probably just brush it on to a few critical areas where high voltage
differential is present, and divider chains where change in impedance might
cause misreading.

Peter

On 16 Feb 2017 13:40, "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,
> >
> > I bought some Dow Corning silicone based conformal coating
>
>
> Do you have access to a clean paint spray gun?
> Preferably driven by an oil free air stream,
>
> There is some discussion of coatings in December 2008 of the old list
> archives,
> where I wrote this, which is worth repeating:
>
>
>    "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.
>
>    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."
>
> http://archives.seul.org/geda/user/Dec-2008/msg00324.html
>

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Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">Thanks guys.<div dir=3D"auto"><br></div><div dir=3D"auto"=
>Might have a spray gun. Truly clean air is less easy, but I&#39;ve got a r=
otary vane compressor (Hydrovane).</div><div dir=3D"auto"><br></div><div di=
r=3D"auto">Think the stuff is too thick to spray without diluting. Data she=
et suggests xylene, which potentiality raises safety issues... not sure qui=
te what I can did here.</div><div dir=3D"auto"><br></div><div dir=3D"auto">=
Might be best to get some quotes for commercial application =C2=A0(otherwis=
e we will probably just brush it on to a few critical areas where high volt=
age differential is present, and divider chains where change in impedance m=
ight cause misreading.</div><div dir=3D"auto"><br></div><div dir=3D"auto">P=
eter</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">O=
n 16 Feb 2017 13:40, &quot;Bob Paddock (<a href=3D"mailto:graceindustries AT g=
mail.com">graceindustries AT gmail DOT com</a>) [via <a href=3D"mailto:geda-user AT d=
elorie.com">geda-user AT delorie DOT com</a>]&quot; &lt;<a href=3D"mailto:geda-use=
r AT delorie DOT com">geda-user AT delorie DOT com</a>&gt; wrote:<br type=3D"attribution"=
><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex">On Thu, Feb 16, 2017 at 4:38 AM, Peter Clif=
ton<br>
(<a href=3D"mailto:petercjclifton AT googlemail DOT com">petercjclifton AT googlemail=
.com</a><wbr>) [via <a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delo=
rie.com</a>]<br>
&lt;<a href=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>&gt; =
wrote:<br>
&gt;=C2=A0 Hi all,<br>
&gt;<br>
&gt; I bought some Dow Corning silicone based conformal coating<br>
<br>
<br>
Do you have access to a clean paint spray gun?<br>
Preferably driven by an oil free air stream,<br>
<br>
There is some discussion of coatings in December 2008 of the old list archi=
ves,<br>
where I wrote this, which is worth repeating:<br>
<br>
<br>
=C2=A0 =C2=A0&quot;A very common misconception is that Conformal Coating is=
 a Hermetic<br>
=C2=A0 =C2=A0Seal.=C2=A0 =C2=A0 It is used a lot in the Coal Mines, and the=
 Electronic Industry in<br>
=C2=A0 =C2=A0general,=C2=A0 =C2=A0to keep the caustic dust off circuit boar=
ds.<br>
<br>
=C2=A0 =C2=A0As Conformal Coating is not a hermetic seal, what real happens=
 is the<br>
=C2=A0 =C2=A0impurities in the water are kept away from the circuit, but th=
e water<br>
=C2=A0 =C2=A0itself reaches the traces [eventually]. Since the water is now=
<br>
fairly devoid of<br>
=C2=A0 =C2=A0contaminates the water acts more like a dielectric insulator. =
You<br>
=C2=A0 =C2=A0never notice it in a low impedance digital circuit, but unless=
<br>
=C2=A0 =C2=A0debugging is an obsession don&#39;t let it get near a RF tunin=
g circuit or<br>
=C2=A0 =C2=A0a high impedance circuit.&quot;<br>
<br>
<a href=3D"http://archives.seul.org/geda/user/Dec-2008/msg00324.html" rel=
=3D"noreferrer" target=3D"_blank">http://archives.seul.org/geda/<wbr>user/D=
ec-2008/msg00324.html</a><br>
</blockquote></div></div>

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