Jeffery, I certainly apreciate your posting as a reminder to me as well. I would add, from a DFM point of view concerning materials and their processing: Getek has good electrical properties, as you say, but processing and some results associated with it can be dissapointing. This material must be processed more along the lines of polyimide. It requires a more damanding press cycle than those for FR4 types using simple straight up processing from 0 to 90 minutes or so. Therefore, not all shops like or do well with it. The Rogers and Arlon (liscensed from Rogers but with slight variations concerning properties) material is really neat stuff. It has processing drawbacks as well as being limited in prepreg glass styles and thicknesses when reinforced. If improperly processed, as with any material type, it has several failing characteristics. As is widely known, this type material often is married/laminated to Getek to meet design and performance requirements. Really low DC and loss tangents. My money is on BT epoxy blends when and where possible. It has high performance characteristics and is easily processed. I have designed it in and used in in very complex, large, high layer count MLB's with great success. It is/was used in some Cray designs built by IBM, as one example. Just wanted to add to your good comments, MoonMan --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------