On 7 Apr 2015 at 15:29, Sue Knight wrote: > We regularly use components 5, 10,and sometimes even 15-20 years > old - not by choice but to support spares and legacy designs :-) > > There are a few strategies: > > 1) Hope > 2) Store in a nitrogen atmosphere > 3) Allow for the fact that you will have to 'refresh' the balls > before use 4) Evaluate an after-reflow cleaning strategy. If cleaning is possible, solder with the most brutally aggressive flux. Regards Matthias Mansfeld -- Matthias Mansfeld Elektronik * Printed Circuit Board Design and Assembly Neithardtstr. 3, D-85540 Haar, GERMANY Phone: +49-89-4620 0937, Fax: +49-89-4620 0938 Internet: http://www.mansfeld-elektronik.de OpenPGP: http://www.mansfeld-elektronik.de/gnupgkey/mansfeld.asc Fingerprint: 6563 057D E6B8 9105 1CE4 18D0 4056 1F54 8B59 40EF ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________