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March 2013

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Subject:
From:
Richard Kraszewski <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Richard Kraszewski <[log in to unmask]>
Date:
Fri, 22 Mar 2013 03:47:36 +0000
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#1 Yes allowed. AABUS(sorry- yes I know, not much help here). 
#2  I have  seen reference to a defense sector customer spec referencing a bubble defined as being an issue if greater than or equal to 1/16 of an inch. No supporting data for this.
#3  No, if for no other reason than FOD.

Rich Kraszewski
(920)969-6075
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, March 21, 2013 9:19 AM
To: [log in to unmask]
Subject: [TN] Conformal Coat and Bubbles

OK, Minions, your next question in the quest to improve J-STD-001 and 
A-610 relates to bubbles in the conformal coating.

I think we can all agree that the ideal conformal coating layer contains 
no bubbles or voids and is "purdy".    BUT:

1.  Are there bubbles in coatings in areas where they will not impact 
reliability and their presence should be viewed as a "Process Indicator"? 
If so, where and what limits would you use?

2.  What would you classify as a bubble requiring disposition, i.e. 
Becomes an actionable defect?  If so, where and why?

3.  Would any of your answers change depending on what KIND of coating it 
is, i.e. Acrylic vs. silicone vs. Parylene?

Well, OK, that is three questions.  I'm on a roll.


Doug Pauls
Chairman, IPC Cleaning and Coating Committees
Galactic Emporer



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