Ed If you are laser drilling the blind vias, the thinner foil can become difficult. It can be done, but with care and some impact on throughput. Carey -----Original Message----- From: Brunker Ed <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Thursday, February 03, 2000 6:03 AM Subject: [TN] 5 MICRON FOIL >We have PCBs with blind vias. The fabrication process goes through two >plating processes so the outer layers are quite thick. To offset this, the >PCB supplier has proposed the use of 5 micron foil instead of 15 micron on >the outer layers to reduce the thickness of the copper. Are there any >drawbacks from using a thinner foil? >Regards >Edward Brunker >Principal 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. >If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or >847-509-9700 ext.5365 >############################################################## > ############################################################## 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 ##############################################################