Hello all, Talk to your board fab shop or get your hands on a copy of IPC-4101A "Specification for Base Materials for Rigid and Multilayer Printed Boards". It contains detailed spec sheets for about 100 different laminates with different UL flammability ratings.
FR4 is usually either IPC-4101/21 material, GLASS TRANSITION (Tg) 110°C-150°C or IPC-4101/24 material, GLASS TRANSITION (Tg) 150°C-200°C. Specify on the fab drawing. (there are others) Note that transition temp is when the material begins to soften not max application temp. There are many factors in determining material. Tg is a part of where the 105 and 130 numbers come from. Hope this helps. Regards, Rick Harrison From: peter merguerian [mailto:[email protected]] Subject: FR4 Temperature Index Dear All, Most boards are UL rated 105deg C and 130 deg C. These ratings may be based on a generic temperature index based on the laminate generic temperature index rating, also assigned by UL. I would like to find out the overall conecensus rating of a board that is using FR4 laminate material and of a specific thickness (thickness should mak a difference when assigning a temperature index). Thanks in advance, Peter "The information contained in this email message may be privileged and is confidential information intended only for the use of the recipient, or any employee or agent responsible to deliver it to the intended recipient. Any unauthorized use, distribution or copying of this information is strictly prohibited and may be unlawful. If you have received this communication in error, please notify the sender immediately and destroy the original message and all attachments from your electronic files." This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
