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August 2001

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Subject:
From:
"Stephen R. Gregory" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 14 Aug 2001 22:04:15 EDT
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Dave,

Surely, not ALL 1700-lbs.? Wooo-doggies! I can only imagine what a task that 
would be!!! I've read some stuff that if you keep the pot static, and keep it 
at a stable temperature for a period (what this really is, I don't 
know...there's varying opinions), the metals will seek their own level 
(according to the different opinions, the copper will be towards the top), 
then you scoop out out the top layer, and replenish what you've removed with 
fresh bars.

The question that I have though, how did the pot get so out of balance with 
copper? I've never had a problem with copper content, even when waving OSP 
boards...tin levels dropping, yes. But not excessive copper...somebody throw 
some pennies in the pot?

-Steve Gregory-


> RJ Klien Wassink suggests [bible p 169] pouring contaminated solder at about
> 190°C through a 20 mesh stainless steel stariner to reduce copper content to
> 0.25%.
> 
> Dave Fish
> 




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