Chris , acrylic is not accepted by the customer, because it does not withstand the harsh environment (alcohol from de-icing wings, nor jet petrol and other stuff) Inge From: [log in to unmask] Sent: den 12 March 2010 11:00 To: Inge Cc: [log in to unmask] Subject: Re: [TN] Vibration issue Is acrylic conformal coat a possibility for you? Has solved some vibration issues for us. Best Regards, -Chris Inge <[log in to unmask]> Inge <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 03/12/2010 01:47 PM Please respond to Inge <[log in to unmask]> To [log in to unmask] cc Subject [TN] Vibration issue Hi all, we are making a very vital part for a aircraft builder. Problem with TQFPs, some 200 legs. There are resonance peaks that kill the package legs. Redesign is not to think of from the customer, so we must do something on inside of the box. One solution (not popular) is to use a string of a glue along the leg rows in order to lock them. Another is to place a vibration dampening mat on one side of the board. That one is more tricky , but there is a US company with lots of stuff for that purpose. Anyone with experience from this area? I should add that not all legs are broken, just one or two after 100 hs of random vibration, but that is of course not acceptable. BGAs would solve the problem, but there is no time for redesign. I'm sorry for coming with a serious message at this holy time of the week. Thanks /Inge ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- 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 ----------------------------------------------------- This e-mail message is intended only for the use of the intended recipient(s). The information contained therein may be confidential or privileged, and its disclosure or reproduction is strictly prohibited. If you are not the intended recipient, please return it immediately to its sender at the above address and destroy it. ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- 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 -----------------------------------------------------