I'm a big fan of the Kester K100LD. This is a 63/37 type eutectic that I like to use. My only complaint about this solder wire is that the 275 flux core is weak and I often have to add more flux or the solder doesn't flow properly. The addition of Kester 951 Flux is a good combination with this solder. If you want the best lead free solder I recommend Kester 48 flux. The flux is much stronger and the solder flows better.
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