Murulidhara, I think you would generally trust the data coming from your laminant supplier. If you had a failure that appeared to be the material you could ask them to retest retains or from your stock. If you had doubts at that point you could use an independent lab with a DSC or a TAM, both fairly expensive piece of equipment that require a level of expertise to operate. Make sure you compare the Tg to the UTg and the difference should only be about 2 or 3 C. Chuck Brummer -----Original Message----- From: Murulidhara [mailto:[log in to unmask]] Sent: Wednesday, May 11, 2005 12:19 AM To: [log in to unmask] Subject: [TN] Tg measurement Dear Technetters,We are manufactureing professional grade PCBs mainly for telecommunication equipments. We do not have facilty to measure Tg of copper clad laminates. We go by the report given by the copper clad manufacturer. Is it a must for PCB manufacturers to have facility for checking Tg value. Or it is enough to go by the test report of laminate manufacturers. What is the method used to measure Tg. Is it very expensive. Are there any alternate methods to check Tg. Thanks in advance, Regards, Murulidhara.S --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------