Hi Steve, Your fractures are caused by the thermal expansion of the resin surrounding your PTHs which are stretching your PTH Cu barrels by over 10%. The presence of Au certainly does not help matters either. What is the point of the10 thermal cycles of 54 Deg. C <-> +95 Deg. C; that is like driving a car into a stone wall before selling it to the customer. Werner Engelmaier Engelmaier Associates, Inc. Electronic Packaging, Interconnection and Reliability Consulting 23 Gunther Street Mendham, NJ 07945 USA Phone & Fax: 201-543-2747 E-mail: [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************