Acid Core Solder is a general purpose solder for repairing galvanized gutters, filling metal seams and other general repair. Acid Core Solder should not be used on electrical parts. 361°F - 460°F melting range for 40/60 Alloy. General purpose solder for repairing galvanized gutters, filling metal seams and other general repairs. Contains lead. Not for use on drinking water lines. Acid flux is contained in the wire core; no external flux is needed. Not for use in electrical applications.