1) Have you tried 100 cycles with other boards, non-polyimide, to check if the plating cracks? 2) GI should not move as much as GF material so there isn't as much stress on the plating 3) If GI prepreg is not cured, all bets are off and it could be moving more 4) What does etchback or desmear look like when comparing prepreg and core If the GI prepreg is not cured, you might get more attack than on the cured core material. Susan Mansilla Robisan Lab ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################