95% tin and 5% antimony alloy. Melt point range of 450 to 464 F. General purpose for sheet metal, radiator repair and galvanized gutters. Acid flux is in the core of the solder. Model # 03390 Features: Lead Free 95% tin and 5% antimony alloy Acid flux core Melt point range of 450 to 4604 F For sheet metal, radiator repair and galvanized gutters,Hardware > Tools,Black Swan Mfg. Co.