So can we say that is is used nowadays or it is obsolote I mean it is very similar to FR4 and FR5 is cheaper than FR4? -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Jeffrey Bush Sent: Thursday, May 19, 2005 2:53 PM To: [log in to unmask] Subject: Re: [TN] FR5 FR4 is standard epoxy, where FR5 is modified for Hot-Strength-Retention and is more suited for higher operating temperatures. It was developed due to the issues/costs with processing BT and Polyimide years ago. Avionics used it quite a bit and it was a plug in for MIL shops as your qual for FR4 extended to FR5 and it processed very similar. With all the advancements in materials over the past 20 years it has been reduced in use - mainly we see it only on older drawings that cannot be updated because no $$$ exists in the contract to implement updates. Jeffrey Bush Director, Quality Assurance and Technical Support VERMONT CIRCUITS INCORPORATED 76 Technology Drive - POB 1890 Brattleboro, Vermont 05302 Voice: 802.257.4571.21 Fax: 802.257.0011 http://www.vtcircuits.com -----Original Message----- From: Baski Devre [mailto:[log in to unmask]] Sent: Thursday, May 19, 2005 6:41 AM To: [log in to unmask] Subject: [TN] FR5 Hello Technetters Do you know the differences between FR4,FR5 and CEM3. What does FR5 mean? what are its properties. Can you advice me any web adrdress or data sheet of FR5 to compare it FR4 and CEM3? Thank you for your incomming suggestions Yusuf GOMEC Product Quality Engineer BASKI DEVRE SAN. ve TIC. LTD. STI. Ceyhan Sk. No:10 81490 Pendik-Istanbul-Turkey Tel:0090 216 3901036(4 Line)/4836560(4 Line) Fax:0090 216 3544941/4913269 Gsm:0090 533 6579897/7480014 Internet: www.baskidevre.com.tr --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------