A 30-layer board we are in process of designing is under discussion of materials to use and their related advantages and disadvantages. The current design has the top 8 layers using N4000-13 for signal/gnd, the next 12 layers using GETEK for power/gnd, and the bottom 10 layers again using N4000-13 for signal/gnd. The proposed design is all N4000-13 SI. The debate is what advantages/disadvantages there are between the two designs besides the original design requiring longer, more expensive processing. Feedback is greatly appreciated. Best Regards, Rick ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu