First, common sense tells me that I wouldn't want to get near the glass transition temperature, which is an easy value to get from the material data sheet. Look for the value of "Tg" listed there Secondly, I seem to remember that 135 degrees C is a safe number, but I can't remember where I "know" that from, (so you should probably take that with a heaping tablespoon of suspicion) and, unless you are measuring an actual circuit or have better simulation software than I do, its difficult to determine just what the temperature will be. Is it around other high current traces? Is it over a plane? air flow? high altitude? mounting structure? If you can provide a few parameteres you might get more participation Jack On 4/21/08, Pucket, Larry Lee <[log in to unmask]> wrote: > > I have a customer that is doing some trace analysis. He is wondering what > the acceptable trace temperature would be on an FR4 board before damage > would occur (or better yet, the board/trace would be compromised)? Thanks in > advance. > > > *Larry L. Pucket* > Dept. 2992 > Sandia National Laboratories > P.O. Box 5800 MS 0628 > Albuquerque, NM 87185-0628 > phone:(505)844-1711 fax:(505)844-9044 > email: [log in to unmask] > > > > ------------------------------------------------------------------------------- > DesignerCouncil 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 DesignerCouncil > To temporarily stop/(start) delivery of DesignerCouncil for vacation > breaks send: SET DesignerCouncil NOMAIL/(MAIL) > Search previous postings at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16for additional information, or contact Keach Sasamori at > [log in to unmask] or 847-615-7100 ext. 2815 > > ------------------------------------------------------------------------------- > --------------------------------------------------------------------------------- DesignerCouncil 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 DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------