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June 2011

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From:
Douglas Pauls <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 29 Jun 2011 10:59:17 -0500
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Jack you ask a very broad question.  I shall use my stock answer of "It 
Depends".

Conformal coating can be applied prior to conformal coating, but you have 
to ask why. Usually your potting material provides your environmental 
protection.  Conformal coating is then non-value added.  If it is there to 
protect your assembly from the potting material, you probably have the 
wrong potting material chosen.

Are there constituents in potting compounds that can affect components? 
Sure.  There are lots of compounds out there.  Choose wisely.

Are there residues that can inhibit potting cure?  Absolutely.  Clean 
carefully.  Test thoroughly.  Choose wisely.

I feel like the Knight in Indiana Jones and the Last Crusade....

Doug Pauls



Jack Olson <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
06/29/2011 10:39 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Jack Olson <[log in to unmask]>


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<[log in to unmask]>
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Subject
[TN] Potting over Conformal Coat?






Are any of you familiar with conformal coating assemblies before applying
potting compound?

Are there potting compounds that contain harsh chemicals that could affect
components?
or
Are there residues on boards that can affect the curing properties of
potting compounds?

I can only find one vague sentence about this in the Working Draft of
IPC-HDBK-850
(3.12.9.1 Compatibility)

thanks,
Jack


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