Rich: Firstly, we haven't suffered much from this disease lately. Either our good fortune was due to Bill Clinton pardoning it just before leaving office, or the laminate materials have gotten significantly better. Most FR4 materials today have Tg's of 140C or better, which has helped. Regards the testing, I don't think any IPC-TM was capable of discriminating or predicting which materials or boards would measle. The best tests were company-specific, used by Advance Circuits in Mpls and Texas Instr among several. They involved preparing the laminate specimen by etching half so it was clad one side/etched opposite side and then alternate that on the other half. Then do the solder float and inspect for the famous white spots. The key was that the IPC method called for solder floating samples that are entirely etched or fully clad both sides - the etched sample never failed and you never saw what was underneath the cladding on the clad sample. Jim PS Was the spotted owl's problem just a viral infection? -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Kraszewski Sent: Wednesday, August 11, 2004 11:41 AM To: [log in to unmask] Subject: [TN] IPC Test methods for measeling of laminate Can any one tell me what the appropriate IPC test methods would be measeling of FR4 laminate? I understand there is a float test of some sort. Rich K / KEDS --------------------------------------------------- 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 ----------------------------------------------------- This message was scanned for viruses!! --------------------------------------------------- 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 -----------------------------------------------------