Try hydrogen embrittlement as a root cause. What's the oxygen content of your copper? Bill Davis, Ph.D. Principal & Vice President/IP Managers [log in to unmask] <mailto:[log in to unmask]> -----Original Message----- From: Joan M.Slade [mailto:[log in to unmask]] Sent: Saturday, July 31, 1999 7:13 AM To: [log in to unmask] Subject: [TN] copper cracking I have a question in regards to copper plating cracking on Teflon(tm) materials. The problem is only seen after ni / au plating. If the boards are flexed, the underlying copper cracks. What would cause this ? We are baking the boards and removing humidity issues. ############################################################## 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 Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################