Stannol flowtin tc and tsc lead free solder wire stannol 810203 flowtin tc is a lead free alloy developed to replace eutectic or close to eutectic tin lead alloys flowtin tc is based on a tin copper alloy switching to lead free with flowtin tc requires no adjustment to temperature profiles for hand soldering this means a longer lifetime for solder tips the properties of the resulting solder joints are in every respect comparable to or better than those of solder joints produced with snpb