copper tungsten alloy was producted by powder metallurgy precess, is a pseudo-alloy of copper and tungsten,  combining the strength of the both metal, with high electric and thermal conductivities.

copper tungsten alloy properties:

name	Cu%（wt）	W%（wt）	RWMA Class	density (Min)	electric conductivity (Min)	hardness (Min)	thermal conduvtivity	thermal expansivity
CuW55	45±2	Balance	10	12.30g/cm3	49%IACS	125HB
CuW60	40±2	Balance		12.75g/cm3	47%IACS	140HB
CuW65	35±2	Balance		13.30g/cm3	44%IACS	155HB
CuW70	30±2	Balance	11	13.80g/cm3	42%IACS	175HB
CuW75	25±2	Balance	12	14.50g/cm3	38%IACS	195HB	200~230 (W/mK)	9.0~9.5 (10-6/K)
CuW80	20±2	Balance		15.15g/cm3	34%IACS	220HB	190~210(W/mK)	8.0~8.5 (10-6/K)
CuW85	15±2	Balance		15.90g/cm3	30%IACS	240HB	180~200(W/mK)	7.0~7.5(10-6/K)