[Boatanchors] Kester 88

[J. Forster]

There is another iussue.

Many systems are very, very expensive...  like satellites, space launch
vehicles, and communication systems. If failures are repairable, it is
very costly to find a bad joint.

There was a thread about HP's quality control on another list. One point
was that it is impossible to inspect in quality. It has to be built in.

Compared to the cost of a system, the cost of discarding a roll or two of
older slder is trivial.

Best,

-John

=============



> It sounds to me like the Kester rosin core reacts with the lead.  And with
> the higher (70%) lead content, the reaction goes faster.
>
> I've been using Ersin Multicore mostly since the 70's.  The two rolls I'm
> currently using must date at least 15 years back, and I've noticed no
> problems as recently as the day before yesterday.
>
> In a message dated 09/14/2011 16:18:31 PM Central Daylight Time,
> bluegrassdakine at hotmail.com writes:
>> I still have a problem with solder having a shelf life.  What does the
>> lead
>> change into that it will not work?  I can see if the rosin volatiles
>> evaporate or change chemistry a bit. but lead?  Just use activated rosin
>> and
>> it should work fine business.  I wouldn't waste money to purchase a
>> whole
>> new roll for those tight applications, maybe just a small tube of rolled
>> up
>> solder for those applications and the regular roll with your bottle of
>> other
>> rosin for the major soldering.  Just my .02 cents worth.
>>
>> -----Original Message-----
>> From: kmd xplornet.ca
>> Sent: Wednesday, September 14, 2011 8:08 AM
>> To: boatanchors at mailman.qth.net
>> Subject: [Boatanchors] Kester 88
>>
>> Hi Guys,
>>
>> Thanks for all the advice on solder. I have definitely learned a few
>> things.
>> Especially that solder can go bad.  Here I thought I was losing my
>> technique, but I opened a 'newer' roll of solder and it worked much
>> better.
>> The old one pound roll I was using is over 6 years old. And I'll get
>> some
>> 'active roisin' and give it a try.
>>
>> 73,
>> Keith
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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