... clearance of brazing seam.Use for copper and copper alloy parts,refrigeration compressor,not suitable for brazing attacking shocking bend ... ,a little higher melting point.Use for copper and copper alloy parts,suitable for air conditioning,refrigerator,evaporator,heat exchanger ... 7.5The balance640680Low melting point,easy flow.Use for copper and copper parts of water heater,water fountain,fuel gas ...