Scott, Entrapment of process chemicals could arise, especially if using OSP. Blow out of entrapped air causing a volcano looking tent. We have resorted to a 1:1 of the finished hole diameter to allow venting. This has worked quite well. Keep in mind LPI sticks to Cu much better than Au. Have a nice day, Shawn Utz Tera Computer Co. > > From: Scott Buscomb <[log in to unmask]> > Subject: [DC] Soldermask over Vias > To: [log in to unmask] > Content-Type> : > text/plain> ; > charset=us-ascii> > Content-Length: 1048 > > What are the drawbacks to tenting vias? I am planning on tenting vias > using LPI both sides on SMOBC. The vias are .013 and .020. I realize the > LPI is pulled into the holes causing a thinning of the mask. > I am trying to prevent solder bridging during reflow and wave soldering. > > Any comments would be appreciated. > TIA, > Scott Buscomb > > ################################################################ > DesignerCouncil E-Mail Forum 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 DesignerCouncil <your full name> > To unsubscribe: SIGNOFF DesignerCouncil > ################################################################ > Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 > ################################################################ > > ################################################################ DesignerCouncil E-Mail Forum 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################