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March 2013

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Subject:
From:
"Garcia, Rigo (GSFC-300.0)[ARES CORP]" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Garcia, Rigo (GSFC-300.0)[ARES CORP]
Date:
Thu, 21 Mar 2013 10:29:31 -0500
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Hi Doug,

Are you familiar with NASA-STD 8739.1A?

This standard answers most of the questions you are posing.

Rigo

Principal Flight Hardware Technology Assurance Engineer
NASA, Goddard Space Flight Center
Workmanship Standards, Code 300
Phone. (301) 286-6129
Fax.     (301) 286-6576

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, March 21, 2013 11:19 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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