Ingemar,
Ipc-A-610 asks for clear appearance in all 3 classes. Bubbles aspecially
between electrical connections are always an issue, because they reduce
isolationresistance, are or might become a home for residues.
Regards
Frank
Hernefjord Ingemar <[log in to unmask]>
Gesendet von: TechNet <[log in to unmask]>
25.08.2009 14:56
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TechNet E-Mail Forum <[log in to unmask]>; Bitte antworten an
Hernefjord Ingemar <[log in to unmask]>
An
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Re: [TN] Antwort: Re: [TN] Manual spraying, further qs
Frank,
thanks for a hand. Think we have most of the IPC stds, so it ought to be
somewhere in the paper mountain.
Vital question: do all of you demand that the conformal coating shall be
glass clear, and if so, why?
/Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Frank Kriesch
Sent: tisdag 25 augusti 2009 11:20
To: [log in to unmask]
Subject: [TN] Antwort: Re: [TN] Manual spraying, further qs
Ingemar,
IPC-CC-830,Qualification and Preformance of Electrical Insulating Compound
for PWB tells you e.g. about the required apperance of Conformal Coating.
IPC-SM-840C, Table 1 lists all the requirements for the qualification of
soldermasks. Adhesion Conformal Coating is one of them. But has to be
agreed with user and supplier.
Regards,
Frank
Inge <[log in to unmask]>
Gesendet von: TechNet <[log in to unmask]>
24.08.2009 23:38
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TechNet E-Mail Forum <[log in to unmask]>; Bitte antworten an Inge
<[log in to unmask]>
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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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