Hello Frank had what looks like the exact same thing a few years back happening predominantly or exclusively in small vias ? our problem was airbubbles in the holes, preventing circulation and plating fixed this with mechanical agitation. good luck / Wolfgang > -----Original Message----- > From: Frank Freitas [SMTP:[log in to unmask]] > Sent: Friday, October 29, 1999 11:04 AM > To: [log in to unmask] > Subject: [TN] Tapered Voids > > I'm looking for some information on the causes of tapered voids and how to > eliminate them from the PWB manufacturing process. > > ----------------------------------------------- > FREE! The World's Best Email Address @email.com > Reserve your name now at http://www.email.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 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 ##############################################################