Joe: they are mutilayer polyimide P96 boards, from Isola. they (the "Voids' ) are pervasive i.e. everywhere , the laminate maker (Isola) swears that these are where the brominated compounds are or were and thus are NOT voids. we are doing SEM now, butt it is worrisome that if this is true then how good are the visual standards that are suggested by IPC? Thanks again. Prasad Godavarti (Dr. G) Principal Materials Engineer Orbital Sciences Corp. 4808146238 (phone) Joe Fjelstad <[log in to unmask] To: [log in to unmask] OM> cc: Sent by: TechNet Subject: Re: [TN] Borminated Polymide <[log in to unmask]> 08/29/2003 07:08 AM Please respond to "TechNet E-Mail Forum."; Please respond to Joseph9000 Hello Prasad, A quick couple of questions. Were these multilayer boards? (I am assuming they are but have to ask) How pervasive are the voids and where were the voids located? Are they in the core material or near the knit lines between layers perhaps? It may be that some organic contamination was entrapped during lamination and that it volatilized during the high temperature lamination process required for polyimide resins. Just a possibility... Good luck, Joe --------------------------------------------------- Technet Mail List provided as a free 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------