Leaded solders are suitable for a number of General Purpose applications. These products are safe to use with any of their Fluxes. Please note that General Purpose solder can't be used for Plumbing applications. 16 oz., Dimensions: 1/4" x 7/8" x 13.12", general purpose BAR solder. 40% Tin, 60% Lead. Begins to melt at: 361 degrees F. Completely melts at: 460 degrees F.