Copper-Phosphorus Brazing Rods

Copper-phosphorus brazing alloy

P 5.9–6.5 %. Because the phosphorus removes the oxide from the copper surface during brazing, no flux is needed for copper-to-copper joints; flux is used for joints with brass or bronze. It starts to melt at about 710 °C. It is not used on steel, cast iron or nickel alloys, because phosphorus forms brittle compounds with iron and nickel. It is the most widely used type of brazing alloy for joining copper tubes in refrigeration, air conditioning and plumbing.