Alloy of tin, silver, copper and bismuth. Works with any high grade paste or liquid flux and a standard propane torch. Oatey No.95 tinning flux recommended. Provides excellent flow and fill characteristics with a melting range of 420 to 460° F; 0.117 in diameter. Used for tin plate work, sheet metal seaming, and hot water heating lines. Meets requirements of Safe Drinking Water Act for use on copper potable water lines.