From my training in the Navy as a 2M (Miniature/Microminiature) Tech I can tell you that 60/40 is not what he is talking about. He is talking about 63/37. With Eutetic Solder when it drops 1 degree it goes from liquid to solid. With 60/40 it has what we call a “plastic” stage where it is malleable and can turn into a problem.
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