Alain, Just a thought. If you dried the boards at room temperature, 0%RH, would this reduce their reliability? > It increases cross linking inside the epoxy of the laminate, > making is slightly more brittle and harder every time you > bake it. It alsoi ncreases the speed of tin oxide formation, > in effect it ages the board. > > It has also been suggested that a high temperature bake > (> Tg) may cause warpage in a pressed board. > > Alain Savard, B.Sc. > Chemical Process Analyst > CAE Electronics Ltd. > e-mail: [log in to unmask] > > -----Original Message----- > > Why does baking the board reduce > the reliability and life expectancy of the board? > Eric Christison ############################################################## 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 ##############################################################