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grade	Composition	Density g/cm	Hardness	Electrical Conductivity % IACS	Application
CuW60	60% Tungsten	13.0	145 HV	52	Arcing Contact
CuW70	70% Tungsten	14.2	197 HV	46	Arcing Contact Vacuum Switch
CuW72	72% Tungsten	14.5	200 HV	40	Spark Erosion {~} Electro Chemical Machining
CuW75	75% Tungsten	14.8	220 HV	44	Arcing Contact
CuW75	75%Tungsten	15.2	240 HV	40	Projection Welding
CuW78	78% Tungsten	15.2	230 HV	40	Arc Contact resistance welding
CuW80	80% Tungsten	15.5	235 HV	40	Arcing Contact
CuWC67	67% Tungsten Carbide	12.7	350 HV	32	Electrical Upsetting