Hi Tom,

I ran into this problem a few years ago - check the list archives. As I
recall, the consensus was the flux core was protected by the solder and
shouldn't expire.  A down & dirty test could be to compare basic
solderability for the expired with in date flux-core wire.  If the stuff
still wets, passes a pull test and can't be distinguished from in date
solder then you could "requalify" it.  I'd be interested to hear what one of
the solder manufacturer's has to say about a requal procedure.  It might be
more of a marketing tool, such as the "best used by" date on soda cans.

Hans

Integrity First  -  Service Before Self  -  Excellence in All We Do
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Electronics Engineer
Warner Robins - Air Logistics Center (WR-ALC/LUGE)
226 Cochran Street
Robins AFB GA 31098-1622

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-----Original Message-----
From: Roger Bilham [mailto:[log in to unmask]]
Sent: Wednesday, February 13, 2002 2:49 AM
To: [log in to unmask]
Subject: Re: [TN] requalification of expired flux-core solder


As a follow-up question, has anyone ever come across flux cored wire
which has become functionally defective through age? Provided that the
temperature isn't excessive and the outer layers of the wire are
protected from surface oxidation, cored wire should last almost
indefinitley, shouldn't it?

Roger Bilham

In article <48359946794DD511BA3A00508BA5563F0ECE1A@MERCURY>, Ochenas,
Tom <[log in to unmask]> writes
>
>    Does anyone know of a method/standard for requalifying expired flux
>    core solder wire (62/36/2)?
>
>    The simpler the better...
>
>    Thanks In Advance,
>
>    Tom Ochenas
>    Process Engineering
>    Maxtek Components Corporation

--
Roger Bilham
Roger Bilham Consultancy
Tel: +44 (0)20 8467 8819
Fax: +44 (0)8700 548 613
Mobile +44 (0)7 941 122 446

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