A list member pointed out my omission of "silver solder" with is also a lead free formulation. Silver Solder (SnAg) with a Tin/Silver ratio of 96.5 / 3.5 (eutectic ratio) melts at 430 F / 221 C Pure Tin (Sn) melts at 450 F / 232 C . Properties of various solder alloys http://www.kester.com/en-US/technical/alloy.aspx w9gb