Application
Alloying platinum with ruthenium has the mostmarked effect upon both hardness and resistivity.However, the limit of workability is reachedat 15% ruthenium. The lower cost and the lowerspecific gravity of ruthenium offer an appreciableeconomic benefit as an alternate to otherplatinum alloys. Platinum-ruthenium alloy, with 10% ruthenium,has a melting point of 1800°C, and anelectrical conductivity 4% that of copper.