Description: Superior No. 18 is designed for spelter and conventional brazing of brass, bronze, Copper Nickel alloys and steel. It is non-bubbling, flows quickly and smoothly, and draws the melting spelter or Silver brazing alloys through the joint interstices. Oxides and other impurities are floated to the surface, resulting in strong, non-porous joints. Applications: Brazing of brass, bronze, copper, nickel, silver and steel. Mainly used for brazing of brass musical instruments, especially tubas and other large instruments. Information provided by Superior Flux |