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



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