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July 2011

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Subject:
From:
"Bush, Jeffrey D. (US SSA)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bush, Jeffrey D. (US SSA)
Date:
Thu, 14 Jul 2011 08:39:18 -0400
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Bridging would indicate a reduction in the minimum surface coating requirement on either end.  So it you break the bubble and you still have the minimum thickness on the conductor you are OK.

Jeffrey Bush
BAE Systems Incorporated 
Electronic Systems Division
IS&R - Space Products and Systems
P.O. Box 868, MER24-01G43
Nashua, NH 03061-0868
Office +1 603.885.8137
Mobile +1 603.318.8056
Fax +1 603.885.5258


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
Sent: Thursday, July 14, 2011 3:34 AM
To: [log in to unmask]
Subject: [TN] IPC-A-610 Conformal Coating - Coverage

Dear All,

 

Can some kind souls help me to interpret the below statement taken out
from IPC-A-610 Section 10.5.2.2 Conformal Coating - Coverage? I am look
at Class 3 and I am loss on its interpretation, especially 'Voids or
bubbles'.

 

Acceptable - Class 1, 2, 3

No bridging of adjacent lands or conductive surfaces from :

*         Loss of adhesion (mealing)

*         Voids or bubbles

*         Dewetting

*         Cracks

*         Ripples

*         Fisheyes or orange peel

 

It is common to find bubbles trapped between the soldered leads of those
gull-leaded components and between closely mounted SMDs passives for
brushing method. Are these bubbles allow for Class 3?

 

Thanks and regards,

~wee mei~


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