Copper Phosphorus Brazing Filler Metals (BCuP) are alloys composed of copper and phosphorus (Cu-P), or copper, silver, and phosphorus (Cu-Ag-P). They are commonly used for brazing copper and copper alloys. BCuP series brazing filler metals offer excellent electrical conductivity at the joined points, strong mechanical properties, and good corrosion resistance against acids. However, they are not compatible with iron.