Ed, when building blind via boards, some board manufacturers just plate the vias, rather than plating the lines on the entire external surface. They do this with a specially designed mask. This "PTH plate only" process allows better control over the thickness of copper of the lines on boards that require controlled impedance. Hope this helps. > ---------- > From: Ed Cosper[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum.;Ed Cosper > Sent: Monday, November 29, 1999 9:38 AM > To: [log in to unmask] > Subject: Re: [TN] BLIND VIA FAB: > > Are you referring to double plating the entire external surface??? > > Ed Cosper > ABC > > ----- Original Message ----- > From: Brunker Ed <[log in to unmask]> > To: <[log in to unmask]> > Sent: Thursday, November 25, 1999 3:52 AM > Subject: [TN] BLIND VIA FAB: > > > > When fabricating PCBs with blind vias, are there any alternatives to > double > > plating the outer layers? What design for manufacturability issues are > there > > regarding this technology? > > Regards > > Edward Brunker > > Principal Process Engineer > > Sendo > > Centrelink House > > Small Heath Business Park > > B10 0HJ > > UK > > > > ############################################################## > > 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 > ############################################################## > ############################################################## 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 ##############################################################