what element is in solder
Lead-free solders in commercial use may contain tin, copper, silver, bismuth, indium, zinc, antimony, and traces of other metals. Most lead-free replacements for conventional Sn60/Pb40 and Sn63/Pb37 solder have melting points from 5 to 20 Â°C higher, though there are also solders with much lower melting points.he widespread use of this popular lead-free solder alloy family is based on the reduced melting point of the Sn-Ag-Cu ternary eutectic behavior (217 ËC), which is below the Sn-3.5Ag (wt.%) eutectic of 221 Â°C and the Sn-0.7Cu eutectic of 227 Â°C (recently revised by P. Snugovsky to Sn-0.9Cu).