The Interconnection Technology Research Institute (ITRI) group of IPC has run several round robin tests of microvias, including daisy chains of 200 successive vias. The reports are available from ITRI at 11801 Stonehollow Drive, Suite 400 Austin, TX 78753-3263 Phone 512-833-9930 www.itri.org Marshall Andrews or Jack Fischer at ITRI can tell you if the artwork (derived from a Motorola test pattern) is copyrighted or can be licensed. We at MacDermid found that we needed a chain of 2000 successive vias to be more confident about our process conditions. Conductor Analysis Technologies - <A HREF="http://biz.swcp.com/cat">http://biz.swcp.com/cat</A> - is a consulting group that defines shop capabilities to make different structures - line/space, layer registration, and microvias. Their recent e-mail stated: The current issue of Between the Conductors, a monthly technical publication from Conductor Analysis Technologies, Inc., is now available from our web page at: http://biz.swcp.com/cat Title: Via Capability and Quality First…Then Reliability Description: Process capability and quality must be achieved before performing reliability studies. Please send an email to [log in to unmask] <mailto:[log in to unmask]> if you know someone who is interested in receiving this notification. Hope this helps - Denny Fritz MacDermid, Inc. ############################################################## 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 ##############################################################