Daan, I always respect your input. I have studied and written a bit on this subject over many years. The fact remains, we have serious problems processing plated through holes as is evidenced by recent postings on this fourm. Another fact remains, though I'm all for the highest Tg materials available in my MLB constructions, higher Tg materials don't make good designs, as such, better. Earl --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------