Agree with denise. I didnt think these were reason for rejection, but you need to look at an etched sample to be sure.
Joey Rios
PWB & Process Quality Eng'r
Endicott Interconnect Technologies
1093 Clark St.
Endicott, NY 13760
Office: 607-755-5896; Cell: 607-206-3642
-----Denise Chevalier <[log in to unmask]> wrote: -----
=======================
To: <[log in to unmask]>
From: Denise Chevalier <[log in to unmask]>
Date: 08/14/2013 10:25AM
Subject: Re: [IPC-600-6012] Wicking Requirement IPC 6012B/3A vs 6013C/3A
=======================
I agree a slight etch would make this easier, but from what I can see in
the photo the wicking measurement starts where the copper plated around
protruding glass and per IPC-600 wicking is measured from the laminate
edge so if there is etch back of any kind then you could gain some.
Also per 6012 the combination of etch back and wicking shall not exceed
the maximum allowable sum of both of these which also suggests that
wicking be measured from the laminate edge and you should ignore
protruding glass.
Truly wicking is the capillary action of the copper seeping around the
glass not the plating of protruding glass.
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of
Dieffenbacher, William C (US SSA)
Sent: Wednesday, August 14, 2013 7:59 AM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] Wicking Requirement IPC 6012B/3A vs 6013C/3A
Pete,
I agree with Randy. Etch the sample to see where the etchback ends
along the foil. IPC-6012C-2010 paragraph 3.6.2.6 and Figure 3-11
explain how to measure the maximum allowable copper beyond the end of
the foil.
Bill
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Reed,
Randy
Sent: Tuesday, August 13, 2013 6:02 PM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] Wicking Requirement IPC 6012B/3A vs 6013C/3A
Hi Pete -
I cannot see the demarcation line on the foil. This needs to be visible
to determine how to start the wicking measurement. The wicking
measurement is an after etch inspection. The measurement at the end of
the wicking (closest to the m in mils) is set correct.
The desmear method(s) is not relevant to the wicking measurement.
Whatever combination of processes that are being used to clean the
holes, the wicking maximum limits cannot be exceeded.
The sample needs to be etched to provide insight on why the wicking
exceeds the maximum limit. The demarcation lines will provide clues on
the drill, desmear, and plating integrity/quality.
One observation is the core material had the wicking failure and the
neighboring prepreg dielectric opening does not appear to the same
wicking length. Does this observation track true for all the dielectric
openings? If this is the case, this may be a material issue from the
laminator and/or a press cycle issue. More information would be needed
to explore this as a cause for the failure.
Randy
Randy Reed, ASQ CQE
Reliability Lab - N.A.
Viasystems Group, Inc.
Forest Grove, Oregon
Phone: 503.992.4421 Cell: 503.545.0150
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Pete
Menuez
Sent: Tuesday, August 13, 2013 2:19 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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513-767-3778 Cell
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