Lead Free No-Clean Flux Core Silver Solder, SAC305 .031-Inch, 4 Ounce Spool Excellent quality general purpose solder Melts at 430 Degrees F (221 Degrees C) No-Clean Flux Core Contains: 96.5%Sn / 3% Ag / 0.5%Cu For use on Circuit Boards and flux reside is non-corrosive