SUPERFLOW® 5 is a Phos-copper brazing alloy formulated to join copper, brass and bronze. This alloy may be used where joint clearance are wider than desired and will fill moderate size gaps. Superflow brazing flux is needed when working on brazeable grades brass or bronze. Phos-Copper alloys are self- fluxing on copper but should not be used, on copper alloys containing more than 10% nickel, steels, and ferrous metals or in any sulfurous atmospheres. Aluminum bronze requires the use of Aluminum bronze brazing flux.