Oatey Acid Core Wire Solder is a tin-lead alloy wire solder with an acid flux core. This solder is designed for general use, such as repairing galvanized gutters and filling metal seams. 40/60 alloy made of 40% tin and 60% lead. 361-460°F melting range Contains lead; it is illegal to use this product in the installation or repair of any plumbing providing water for human consumption. Flux and solder in one saves time and money; increases bond strength; and ensures even application of flux and solder.