The first clue I would look for is what metal is showing on the surface when you turn over your tape and look at it. You say your tape is pulling off the tin and exposing bare copper on the pcb, but you need to determine exactly what metallic junction is being broken. If you see tin on the underside of the tape, you have a failed tin/copper bond. If you see copper under the tape you have a failed copper/copper bond...which is something controlled by the board fabricators process (ie. electroless copper/flash copper adhesion, flash copper/pattern plate copper adhesion). Bill Parlin Parlin Industries, Inc. www.parlin.com ############################################################## 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 ##############################################################