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January 1997

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Fri, 03 Jan 97 08:41:11
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Good Day Everyone!

     We just got our solder analysis back (it's from a lab that everyone uses) 
for our wave solder pots, and we have one wave solder pot that's low in Tin... 
61.4% to be exact. The recommendation is to add 4.3 lbs. of pure Tin for each 
100 lbs. of solder to return it to the nominal 63%.

     My question is; just how in tarnation did we get one wave solder pot low on
Tin? It don't make sense...we use the same bar solder in all our machines, we 
wave solder basically the same kinds of products in all of our machines. By that
I mean we don't have one line waving only gold plated boards all the time, or 
only OSP coated PCB's all the time, etc.. so what gives?

     This is the very first time that I've ever had a solder analysis come back 
and tell me to put pure Tin into the pot...this is weird. I've had nickel get a 
little high before, but that's about it. We've got three machines and all of the
analysis looks like this:


                Pot-1           Pot-2           Pot-3

Tin             62.4%           61.4%           62.7%
Lead            Balance         Balance         Balance
Antimony       <0.005%         <0.005%         <0.005%
Copper          0.039%          0.048%          0.033%
Gold            0.017%         <0.003%         <0.003%
Silver         <0.001%         <0.001%          0.002%
Aluminum       <0.001%         <0.001%         <0.001%
Arsenic        <0.010%         <0.010%         <0.010%
Bismuth         0.001%          0.001%         <0.001%
Cadmium        <0.001%         <0.001%         <0.001%
Indium         <0.005%         <0.005%         <0.005%
Iron           <0.003%         <0.003%         <0.003%
Nickel          0.006%          0.005%          0.004%
Zinc           <0.001%         <0.001%         <0.001%


The analysis was conducted according to specifications in IPC-S-815B. As you can
see, Pot-2 is the "slacker" tin-wise. The only noticable difference that I can 
see between the other two is that the copper content is just a tad higher...does
that have anything to do with anything? Looking at the tin content on the other 
two pots, they're just barely above the limit which is 62.4%-63.6%...is my bar 
solder vendor starting to get tight with the Tin? Any light that anybody can 
shed on this would be 'preciated...

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