FB102C-21 Lower corrosive, good fluidity, brazing with silver filler metals for brazing copper and copper alloys, copper and Bun FB102C-21Lower corrosive, good fluidity, brazing with silver filler metals for brazing copper and copper alloys, copper and Bundy pipe, copper and stainless steel.Good brazing results at hydrant, valve,refrigerator tube, kitchenware, hardwareand glasses.