Have you considered dryfilm soldermask? Tim Reeves > ---------- > From: Jeff Hempton > Sent: Monday, October 18, 1999 11:48 AM > Subject: lpugged vias, or no plugged vias? > > Hey gang, > In a previous life, we did not worry about plugging vias in > reflow/reflow boards for vacuum pulldown, since we were lower volume, > high mix military bds., and could afford the time at test to > clamshell > or overclamp (Technical test terms I learned recently from the test > group guys...). > > We are no-clean, and high volume. We have Genrad inline testers, > which > work quickly with vacuum pull-down, and the test guys like it this > way. And we have been playing with various methods of plugging test > vias with printed solder paste, and all other vias with LPI, and > either get flux-vs.-probe problems or HASL solder caught in the LPI > via pockets that resurrect themselves as solder balls during reflow! > We have one small 4" square board that has about 300 vias, and are > having a-heck-of-a-time trying to find a good solution for this. Oh, > and all via annular rings must be solder resist covered or conformal > coat covered, due to extreme environmental uses. > > Can anyone out there share some insight into this issue. > Thanx in advance for your collective insights!!! > > Jeff Hempton, Sr. SMD Mfg. Engineer > United Technology Electronic Controls > e-mail: [log in to unmask] > ############################################################## 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 ##############################################################