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June 2009

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Subject:
From:
"Kane, Joseph E (US SSA)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kane, Joseph E (US SSA)
Date:
Fri, 5 Jun 2009 11:54:21 -0400
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I remember searching the TN archives on this issue
some time ago, and the consensus seemed to be that
flux-cored Sn63Pb37 solder should last pretty much 
indefinitely.

The flux core is sealed in very well, though the
flux may be compromised a short distance in from the
severed end of the wire.  Oxide formation on the
outside of the solder shouldn't be an issue either.

This may not hold for high tin or lead-free solder 
alloys.

-Joe

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, June 05, 2009 11:38 AM
To: [log in to unmask]
Subject: [TN] Flux cored wire solder shelf life

Well, we made it to Friday!
 
I'm going ask ya'll a couple of question that I think I know the answer
to, but I want to hear what you think.
 
Right now I'm in the midst of gathering up all my solder dross, expired
solder paste, and wire solder for a shipment to my recyclers. I noticed
we had a bunch of wire solder in the locker of our training room that
was really old, like it was manufactured back in February of 1997. The
alloy is 63/37, the flux core is a pretty active water soluble organic
acid.
 
The manufacturer says that shelf life for flux cored wire solder is
3-years. But when I took some of the solder and soldered with it, it
soldered absolutely fine. Wet and flowed out with no problems
whatsoever.
 
So my question is, have any of actually had any problems soldering with
flux cored wire solder because it was too old? Do you think that
manufacturers shelf life is realistic?
 
Steve

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