CuZnSi brass solder Brass solder Composition (%): Cu: 60 % Zn: 39.7% Ni: - Si: 0.25% other: - Melting point range: 875-895 oC Operating temperature: 900 oC Characteristics: Basic brass solder used for soldering steel. The addition of silicon in the solder protects against zinc evaporation, thus improving the aesthetics and quality of the solder.