Tan
There is no actual requirement that the coating should have a glossy
finish - nor does it say that a matt finish is not acceptable - See
IPC-A610D 10.5.2
However, If you take virtually any conformal coating and apply it to a
clean, dry, bare copper pad, it will be glossy. Now if you apply it to
a bare board surface, with or without a resist, and it is matt, then
that would suggest it has been absorbed into the laminate, in part or
in full.
In this instance the coating would not have the required thickness as
defined in IPC-CC-830.
Does that help?
Regards
Graham Naisbitt
Email: [log in to unmask]
Phone: +44 (0)12 5252 1500
Web: www.gen3systems.com
On 27 Aug 2009, at 03:41, Tan Geok Ang wrote:
> 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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