CP2 is a 2% silver-copper-phosphorus brazing filler metal, which is used to braze copper and copper alloys. CP2 is widely used in the refrigeration, heating and ventilating and air conditioning industries for the brazing of copper pipework systems. CP2 has been used for fittings of copper cylinders where greater ductility is required than the standard copper-phosphorus products used on the seams. It is also used in electrical engineering applications such as the brazing of electric motor rotor bars to end rings. For brazing copper to copper no flux is needed, as CP2 is self-fluxing in this case. For use on copper alloys a separate flux is required.
