Gary, The Interconnection Technology Research Institute (ITRI) organization under IPC has done work on board reliability, including small holes and microvias. I don't remember work on buried vias, but perhaps that has been done, too. Suggest you contact Jack Fisher at ITRI - 513/833-9930 in Austin, Texas or through their web site - think it is "itri.org", or through the IPC site to the ITRI site. Karen Bircher is the administrative assistant who may also be able to help. Denny Fritz MacDermid. --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------