Hi Pete,



For Rev B there is no definitive answer.

This is a "bug" in all revisions until C.  As you know, the changes to paragraph 3.6.2.6  and figure 3-11 are the fix, and in my opinion represents the historical intent.



I have seen 6012B 3/A product deemed acceptable using the T-50 and dictionary "wicking"= "capillary action" argument, which you point out.

I have also seen that argument fail.

Randy points out the alternate usage.  This is very likely favored by your end customer (judging by the use of B 3/A), and that means your picture is likely nonconforming.  There is a catch-22 with this alternate, in that you can get in trouble for assessing wicking on military jobs after microetch (it is disallowed in some revisions).  This might explain why the sample in your image isn't etched.



I have NOT seen the 6012C 3/A wicking requirement enforced without the class 3 para 3.6.2.6 caveat, which in my opinion is legally correct, but good luck finding it in black-and-white.

Assuming this "precedence" with the 3/A club holds, your picture is likely conformant to C 3/A.



And last but not least, with respect to your picture: what part is capillary action and what is glass fiber protrusion?  This conundrum was considered during the fix debate, and I think we worked around it.  BTW, I have not seen this argument used successfully to save B 3/A product.



Good luck at your presentation.



Chris



Chris Mahanna

Robisan Laboratory









-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Pete Menuez
Sent: Tuesday, August 13, 2013 5:19 PM
To: [log in to unmask]
Subject: [IPC-600-6012] Wicking Requirement IPC 6012B/3A vs 6013C/3A



Hello All -



This isn't the best picture but it is all I have.



This cross section is being evaluated to IPC 6012 Rev B Class 3A and is being rejected for wicking in excess 2 mils.  Is this, in you all's opinion, wicking or is this the effect of plasma etch/resin removal/glass etch and not wicking?  How should this be evaluated under B/3A?



How would this be evaluated in 6012 Rev C Class 3A?  Could you even evaluate it since this is before etch?



Comments are greatly appreciated.  Btw, I'm not trying to save anything.

This panel has already been scrapped out - I have a presentation with my customer and I'd like to offer more opinion than just my own and the board fab.





Thanks,

Pete





















Peter Menuez

Supplier Quality Engineering Manager

L-3 Communications Cincinnati Electronics

7500 Innovation Way

Mason, Ohio 45040

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