Superior Nos. 650 and 652 fluoride-free fluxes are creamy, white, brazing pastes that are active and protective to a temperature of 870°C/1,600°F. They were formulated for brazing processes joining copper-based metals, and are recommended for joining copper, brass, and other copper-based alloys. They also work on select ferrous base metals.

Additionally, Superior Nos. 650 and 652 fluoride-free fluxes are superior selections for jewelry and silverware joining applications involving silver and other precious metals. These fluxes do not harden or crystallize and retain their creamy texture for two (2) years.