Colleagues,
 
Question:
Is there any specific concern about solder wire due date IPC quality
level 1?
As per J-STD-001 3.2.2 (including J-STD-006) it is not specified any
requirement for Level 1 about solder purity which could be affected from
due date (oxides growing etc). 
Which is the main concern related on solder due date to be taken into
account? 
 
Have been reading some papers beside the specific IPC stds mentioned
upper, and all comments states something like this (or approach similar
concepts):
 
"The presence of additional oxidation may be visible on the surface of
the wire. You may find that the oxidized surfaces are only on the outer
portion of the cored wire, meaning that you could unspool the wire until
you get down to the less oxidized material.


You can determine if the expired cored wire is still usable by simply
trying it – and if you aren't getting the typical amount of soldering
action (wetting speed, spread) that you normally expect, this means that
the age of the cored wire could cause a performance issue.
I have never heard of a reliability issue related to using cored wire
past the expiration date of the cored wire. The caveat to that statement
is that if the solder is excessively oxidized, the operator may feel
forced to supplement the cored wire with more liquid flux than would be
considered typical or acceptable."
Keep awaiting for your comments.
brgds,Ricardo


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