I am interested in knowing the exact combination of metals and other things in the lead alloy used in the surfacing process. Anybody know?
What surfacing proccess? Can you elaborate a little more for us.
Are you referring to terne (lead-tin alloy) coated steel roofing? Or a lead-copper alloy? Or lead coated copper flashing?
There are safer more environmentally friendly versions of these coatings mostly made of a zinc and tin.
117 alloy used for blocking is a Eutectic Fusible Alloy and its primary component is Bismuth. (The price has gone up, up, up over the past 18 months)
Fusible Alloys include a group of binary, ternary, quaternary, and quinary alloys containing Bismuth, lead, tin, cadmium and indium. The term fusible alloy refers to any of the more than 100 white-metal alloys that melt at relatively low temperatures.