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January 2012

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Subject:
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 12 Jan 2012 13:58:56 -0600
Content-Type:
text/plain
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How about copper foil treated side tooth size?   Tooth size hampered high speed frequency switching signals.

Victor,


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Thursday, January 12, 2012 1:36 PM
To: [log in to unmask]
Subject: Re: [TN] FW: New Question on PWB Analysis

Regardless of the "temptations" involved (and to educate the uninformed)
What factors contribute to lower copper peel strength?

I haven't heard much discussion of that, 
and I don't think my trusty ol' Printed Circuits Handbook addresses it.
(well actually, it discusses TESTING of peel strength in 8.8-8.11, 
and peel strength values, but not cause). 

I would probably suspect bare board issues too, 
unless you can enlighten me...

Jack (aka "the new guy")

.
On Thu, 12 Jan 2012 08:41:02 -0800, Dwight Mattix <[log in to unmask]> wrote:

>"A good PWB will normally fail within the laminate material.  "
>
>That's a pretty broad statement. I wouldn't take that bet personally.
>
>It's tempting as an OEM for failure investigation to begin with the
>premise that responsibility lies with any or all inputs except the
>design, assembly process.  Yep'r, don't keep no mirrors around here to look in.
>
>
>At 07:59 AM 1/12/2012, Woolley, Mark D. (Mark) wrote:
>>
>>
>>I am in the middle of an issue concerning a high temperature Laminate
>>and low pull force copper pads.  The copper can be pulled from the PWB
>>with low pull forces and are failing in the field.
>>
>>I have examined multiple damaged PWBs and have found that in ALL cases
>>the damage is the failure of the copper to epoxy bond.  A good PWB will
>>normally fail within the laminate material.
>>
>>The units are built using Pb-free processes with Pb-free components.  I
>>am trying to determine what can be done to show that the laminate is not
>>good or in the PWB manufacturer did not laminage the layers correctly.
>>I do not have easy access to bare PWBs that have not been processed.
>>
>>
>>
>>Any help or direction would be welcomed.
>>
>>
>>
>>Thanks,
>>
>>Mark
>>
>>mark
>>
>>Mark Woolley |PTRL Laboratory | Avaya | 1300 West 120th Ave |
>>Westminster, CO 80234  USA |
>>
>>Voice (Lab): (303) 538-2166 | email: [log in to unmask] |
>>
>>
>>
>>
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