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October 2012

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Subject:
From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Wed, 31 Oct 2012 11:20:26 +0000
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I am lazy.  Depend upon the hardness of mounting epoxy, you can get away just two papers by grinding: 220 and 1000.  You work your grinding paper by apply different force to make it 220 ware down to 600 (WC particles in the paper almost gone) and 1000 almost like 2400.  Save time (exchange paper) and save grinding paper-provide you buy the good grinding paper that can withstand the long process.  For optical examination after polish, possibly good enough. For sem, some time need add etch-repolishx2 to get the surface I want.  My 2 cents. 
--------------------------
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----- Original Message -----
From: Grossmann, Guenter [mailto:[log in to unmask]]
Sent: Wednesday, October 31, 2012 05:37 AM
To: [log in to unmask] <[log in to unmask]>
Subject: [TN] AW: PWB laminate anomaly, Post Forced RW, BGA

Lois
One could skip the 4000 paper or after the 4000 skip the 6um paste. Apart of that I think the procedure is appropriate.

Best regards

Günter Grossmann
Scientist
Empa
Swiss Federal Laboratories for Materials Science and Technology
Überlandstrasse 129
8600 Dübendorf
Switzerland
Tel +41 58 765  4279
Fax +41 58 765 4054
[log in to unmask]
www.empa.ch


>-----Ursprüngliche Nachricht-----
>Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Louis Hart
>Gesendet: Dienstag, 30. Oktober 2012 16:26
>An: [log in to unmask]
>Betreff: Re: [TN] PWB laminate anomaly, Post Forced RW, BGA
>
>Victor, looking forward to the pictures. One comment I could make is it
>seems like there are a lot of steps in the grind and polish. Any other
>technetters have the same view?  Louis Hart
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
>Sent: Tuesday, October 30, 2012 11:22 AM
>To: [log in to unmask]
>Subject: [TN] PWB laminate anomaly, Post Forced RW, BGA
>
>Fellow TechNetters:
>
>   I have a cross section which has an unusual laminate anomaly.   I
>have seen this more prevalent on LF laminate and hybrids.   The anomaly
>can occur between small PTHs and areas without any hole.   All layers
>seem to be effected.   The numbers are not staggering but of a concern.
>The glass rods seem to break off/separate from the bundle/laminate.
>The medium grind procedure is 1000, 1200, 2400, 400, 6, 3, and 1
>microns slurry with final polish of 0.05 alumina.  I will upload a photo
>to Steve.
>
>Victor,
>
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