The general theory that most customers tell me is that a pcb cannot be conductive since the etchs an components would short out. All material that comes in contact therfore must be dissapative. So if there is enough prevention, the fact that the board is not dissapative is ok. The power and ground planes do offer some protection but they are not dissapative, they are conductive and "bleed" to fast. Hope this helps Jim Gleason ----- Original Message ----- From: Darrel Therriault <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, May 22, 2000 3:19 PM Subject: [TN] 4 oz Cu > TechNetters, > > Design Engineering is requesting we go to 4 oz Cu for a new power module > design, 4 layer PWB. > > Any gotcha's with 4 oz Cu we need to be aware of and is this a fairly > standard job for > PWB houses?? > > Any comments, info or recommended PWB suppliers appreciated. > > Tks......DT > > ############################################################## > 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 > ############################################################## ############################################################## 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 ##############################################################