Hi.  I don't think you've given us enough information about the problem to
make a determination.  For Pb-free, you probably do want a higher Tg board.
 But what is the actual cause of the yield loss?  What have you tried to
improve your yields?

Regards,
Daniel Blass
Process Research Engineer
Area Array Consortium
Surface Mount Technology Lab
Universal Instruments Corporation
http://www.uic.com/wcms/WCMS2.nsf/index/Global_Svc_Support_31.html

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