... shock resistance6, Good chemical resistanceTypical Uses1, Rotating bearing balls and rollers2, Cutting tools3, Engine moving parts-valves, ... High density3, Low thermal conductivity (20% that of Alumina)4, Chemical inertness5, Resistance to molten metals6, Lonic ... fracture toughness9, High hardnessTypical Uses1, Precision ball valve balls and seats2, High density ball and pebble mill grinding ...