Get Werner Engelmaier's white paper, which includes the appropriate and comprehensive fabrication notes to put on the drawings to ensure you get a board you can use. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ted Tontis Sent: Monday, June 25, 2007 9:36 AM To: [log in to unmask] Subject: Re: [TN] UL specification on temp rating for bare board material David, Thanks for the response and the image of your fabrication notes. All of our designs are Pb so I do not have to worry about the elevated temps of a Pb free process. My problem is that the boards I normally deal with are large in size with a great deal of copper pours all over the board. I know from a process and field stand point the boards would be more reliable using a higher Tg. The response I get is that we have large vias to help offset problems with barrel wall strength. Regards, Ted Regards, Ted ----- Original Message ----- From: "David Greig" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, June 25, 2007 9:10 AM Subject: Re: [TN] UL specification on temp rating for bare board material > Ted, > > Here is a snap of part of the notes I use. If your assembling lead free then most < 170C materials are unlikely to be suitable. > > > Best Regards > > David Greig > ______________________________ > GigaDyne Ltd > 5 Albany Business Centre > Gardeners Street > Dunfermline KY12 0RN > United Kingdom > t: +44 (0)1383 624 975 > www.gigadyne.co.uk > ______________________________ > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Ted Tontis > Sent: 25 June 2007 14:50 > To: [log in to unmask] > Subject: [TN] UL specification on temp rating for bare board material > > I have just sent out two designs to be quoted both are high power designs for industrial applications. now I am new here and > thought it would be a good idea to add more detail to the fabrication notes. The material I called out for was 4101/23 or 24 > with a minimum Tg of 170, the old notes didn't call out for anything. So I get the quotes back and my employer said to go back > to the 140 Tg, the new material isn't needed. I tried to explain to him that a 140 Tg used in the environment you expect to have > this product operate in is risky. He explained to me that UL specifies an operating temperature of the material and that we will > never reach that level. I tried to explain to him that's when the material fails in a ball a flames. UL is not concerned if the > product will function correctly or not, their concern is will someone get hurt or die. Is my understanding correct on the UL > requirements? UL is just a flame and voltage limit not a limit on normal operating temperature ranges? > He pays the bills so he can do what he wants however, I am getting tired of trying to explain to him not to confuse we have > never had a problem so far with you have just been lucky thus far. > > Thank you, > > Ted Tontis CID > Manufacturing Engineer > Custom Power Technology > N93 W14605 Whittaker Way > Menomonee Falls, WI 53051 > [log in to unmask] > www.custompowertech.com > Phone: 262-253-0880 > Fax: 262-253-0948 > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 > ----------------------------------------------------- > -- > Virus scanned by Lumison. > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > 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 15.0 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 15.0 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 -----------------------------------------------------