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, > >______________________________________________________________________ >This email has been scanned by the Symantec Email Security.cloud >service. >For more information please contact helpdesk at x2960 or >[log in to unmask] >______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________