Hi Phil, I tried that link at the time and it didn't work so I trashed it. Maybe there was a problem with our Intranet at the time. Do you still have that link? Tim and Ingemar, We are not using embedded/buried capacitors. The capacitance we wish to achieve is on external layers using copper pads. We succeed with the rogers non-UL material. Now we need to replicate the results with a UL material. We are looking to create a capacitance of 0.25pF and these are used in sampling 3.5kV of RF. We do not know precisely what didn't work with the UL Rogers material and why the non-UL did work. At this stage we are just trying different materials and looking at end results for our application, of which I am unable to describe in detail. Colin At 01:44 AM 8/21/2004, you wrote: >hi, > >a couple days ago a url was provided that presented a very extensive table of >properties for several vendors laminate products. did you check there? > >phil --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 847-509-9700 ext.5315 -----------------------------------------------------