Hi Mark, A couple of issues—Question: how do you get storage temperatures of 110C unless you store on an enginine manifold or next to a furnace? Actually, for your purposes the via fill material should have a CTE of roughly the same as the ED Cu—whant yopu need to be worried about is the via cap on top of which you want to build your micro-vias. Werner ************************************** See AOL's top rated recipes (http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004) --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------