It is non-conforming for both the crack and the plating separation.
The second picture is not so clear cut.  If indeed the area at the knee is separation it is rejectable. 
If it is differential microetching, it is not.  Hard to tell from the photo. 
I do not think we have any criteria for burning.    

Elaine

-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Chris Mahanna
Sent: Monday, August 16, 2010 1:19 PM
To: [log in to unmask]
Subject: EXTERNAL: [IPC-600-6012] opinion poll

Hi Everyone,

Attached is a picture of a thru-hole corner after thermal stress.  The plating is pulse.  I believe the corner was 'burnt' because of the geometry of the (conformant) negative etchback.  All the corners show burn; some show blisters; only this one cracked.

In your opinion, what are the non-conformance(s) if any?


Thanks

Chris

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