You are buying 5 x 300mm lengths of 15% Silver/Copper Phosphorus Brazing alloy Rod. This is a silver-copper-phosphorus brazing filler metal, which is used to braze copper and copper alloys. When brazing copper, the phosphorus within the alloy imparts a metallurgical based self-fluxing capability. When this alloy is used to join copper alloys (such as brass, bronze or gun metal) a separate flux will be required because the self fluxing action only occurs on copper/copper joints. This filler metal should not be used to braze ferrous containing materials like carbon or stainless steels or nickel-containing materials as the phosphorus within the filler metal will form brittle, intermetallic, phosphide compounds at the joint interface. 15% Silver/Copper Phosphorus is the most ductile of the silver-copper-phosphorus brazing filler metals and is specified where a self fluxing alloy must be used and joint ductility/electrical conductivity is a factor. The optimum joint gap for brazing is normally 0.05-0.2mm. Composition: 15%Ag, 80%Cu, 5%P. Conforms to: EN 1044 1999 CP102, AWS A5.8 BCuP-5, ISO 17672 CuP 284. Melting range: 644-800°C*. *The flow point for this filler metal is approximately 700°C.