... . It can be used with Copper- Phosphorus-Silver filler metals, for brass-copper; copper alloy-steel joint.Specialty: This flux contains soluble ... 1Use with None or low silver filler metals, for Copper-Brass joint.Are common used for block valve; level glass; ... 2Used with 15Ag silver content filler metals, for brazing copper-copper alloy, copper-Brass, good fluidity, can be use for brazing complicated ...