 Many bismuth alloys have low melting points and are found in specialty applications such as solders . Many automatic sprinklers , electric fuses , and safety devices in fire detection and suppression systems contain the eutectic In19.1 @-@ Cd5.3 @-@ Pb22.6 @-@ Sn8.3 @-@ Bi44.7 alloy that melts at 47 ° C ( 117 ° F ) This is a convenient temperature since it is unlikely to be exceeded in normal living conditions . Low @-@ melting alloys , such as Bi @-@ Cd @-@ Pb @-@ Sn alloy which melts at 70 ° C , are also used in automotive and aviation industries . Before deforming a thin @-@ walled metal part , it is filled with a melt or covered with a thin layer of the alloy to reduce the chance of breaking . Then the alloy is removed by submerging the part in boiling water . 
