Don't forget excessive "Z" axis expansion. The above comments are of my own opinion, and not necessarily that of my employer. http:\www.hadco.com:8080 Dave Hoover (aka, Groovy) NPI Mgr HADCO TC2 Watsonville, CA ---------- From: Paul Sevriens <[log in to unmask]> To: [log in to unmask] Subject: [TECHNET] Corner cracks in electrolytic copper plating. ========================================================================= Date: Monday, October 13, 1997 6:13 AM Dear p.c.b. friends, Because off problems with some of our production boards I, am making a listing for the possible causes of corner cracks in electrolytic copper plating. >From all the information I got, I made the following schedule: * Brittle copper * Excessive brightness * Excessive levelers * Resin content contributing to z expansion * Deletion of nonfuntional pads * Contaminated copper bath * Improper current density * Design Because of the fact that the cracks only appear on the corners some of the above described items can possible be excluded. Who could give me more detailed information? Are there articles in some magazines about this subject? With kind regards, Paul Sevriens. Process engineer ############################################################## 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. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################