Conformal coating with Matt surface is not acceptable?
(Any specification/standard indicated this?)
Thanks!
----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Mon Aug 24 17:38:49 2009
Subject: Re: [TN] Manual spraying, further qs
Thanks Ken,
are there any stds that demand a perfect surface, e.g. any IPC
standards.
And what use to cause outgassing issues? I have several PWB courses
behind,
but many, many years ago. Can dig in my piles, but a faster answer from
TN
seems a bit more comfortable.
/Inge
----- Original Message -----
From: "Ken Bloomquist" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, August 24, 2009 11:20 PM
Subject: Re: [TN] Manual spraying, further qs
> The bad board had beans for lunch, "bad out gassing problem"! :-)
>
> KennyB
>
> -----Original Message-----
> From: Inge [mailto:[log in to unmask]]
> Sent: Monday, August 24, 2009 1:50 PM
> To: [log in to unmask]
> Subject: Re: [TN] Manual spraying, further qs
>
> This very day, I couldn't stay aside but had to do something to help
the
> production guys. So, I took a fresh, naked and qualified board from
> another
> source and did this:
> Put one of our problem boards beside the reference board, both on
bottom
> of
> a larg well box, i.e. no fans blowing, nor any evacuation. Sprayed
both
> simultaneosly. Inspected them after one hour at room temp. The
reference
> board was absolutely perfect, while the other was matte! Had a look in
a
> microscope. The bad guy had thousands of microscopic inclusions and
even
> superficial voids, the reference was perfect. Noticed that the bad
boards
> have a much coarser (looks like the net pattern after screen
> printing)green
> sheet (solder mask) and numerous voids already before spraying. What
is
> your
>
> opinion?
> /Inge
>
>
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