Hi Gerard! I recommend you get a copy of the following paper (although I don't think its the one you are looking for): "A Model For Solderability Degradation" by Dr. Chris Hunt, SMI Conference Proceedings 1996, Volume II, Pages 650-655". The paper does a very good job of covering the basics of intermetallic growth in a simple manner. Good Luck. Dave Hillman Rockwell Collins [log in to unmask] [log in to unmask] on 12/29/97 02:11:06 PM Please respond to [log in to unmask]; Please respond to [log in to unmask] To: [log in to unmask] cc: (bcc: David D Hillman/CedarRapids/Collins/Rockwell) Subject: [TN] CuSn Intermetallic growth I seem to recall that a study was done a while back regarding the rate of growth of Copper tin intermetallics each time a panel was subjected to the HASL process , including reworks. Any information on said subject? Regards. Gerard O'Brien. Photocircuits Corporation ############################################################## 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 ############################################################## ############################################################## 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 ##############################################################