Hi all, anyone had cracked solder joints with even lead lifting with Quadpaks AND conformal coating? What was the reason? Vibration, mechanical shock, tempcycling, warpage, thermal mismatch, voiding, diffusion, Kirkendall or what? The coating is robotic dispensed and the Quadpak is 'drowned' in coating in order to secure the leads against vibration. Personally, I dislike the abundant lot of coating. Am afraid that, at minus degrees, the coating gets hard and less ductil. When the processor is energized and warms up quickly (airgap between Quad and board), maybe the still-at-minus coating (with its low heat conduction) won't match the thermal expansion of the Quad. FEM is done and says no such problems, but FEM isn't the a saviour always! Inge --------------------------------------------------- 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 -----------------------------------------------------