I've also been looking for a spec, but found none. Guess it's hard to
make one with respect to all factors that are involved: the board's
cleanliness after last production step, the atmosphere in which the
board will be stored, gold plating thickness and porosity, humidity,
your planned mounting and soldering process etc. We have tested boards
that have been in office drawers for years, and which ones could be
soldered without problems, as well as we have had problems with same
type of boards coming directly from China. 

Inge 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas McCall
Sent: den 3 mars 2008 15:53
To: [log in to unmask]
Subject: [TN] Max shelf life of a PWB since manufacture


Hi,
Does anyone know if there is an IPC specification that defines the
maximium time after manufacture for a bare PWB from the supplier.  This
I guess would include the time sitting in the shelf at the supplier
before being shipped from them.  The material is
FR4 and the finish is ENIG.  I am assuming that the PWB would not have
to be pre-baked out before PCBA manufacture, but this could be done.
The board fab is in China.
 
Thanks for all input ...
DI McCall.
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