Alloy of tin, silver, copper and bismuth. 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. Works with any high grade paste or liquid flux and astandard propane torch. Oatey No.95 tinning flux recommended. Provides excellent flow and fill characteristics. 415 to 455° Fahrenheit melting range. 0.117 in diameter.