Louis,
The multiple step are intentional to prevent glass bundle shatter during cross section. This is an anomaly that has recently been observed on many LF laminate. At first it was once in a while. Now it appears more common. The preparation process/media hasn't changed, only the laminates.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Louis Hart
Sent: Tuesday, October 30, 2012 10:26 AM
To: [log in to unmask]
Subject: 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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