Tenacity™ No.4A Flux Powder is a medium temperature brazing flux suitable for use with silver brazing filler metals. It has a working range of 600-850°C and is suitable for use with silver brazing filler metals that melt below 800°C. It is useful for brazing larger assemblies in steel or copper wherever prolonged heating may cause general-purpose fluxes to become exhausted. It also finds applications in silversmithing. Information provided by Johnson Matthey Metal Joining |