Tungsten Alloys

		THA-17	THA-17N	THA-175	THA-175N	THA-175M	THA-18	THA-18N	THA-185
Density	gm/cc	17	17	17.5	17.5	17.5	18	18	18.5
	lb/cu. in.	0.614	0.614	0.632	0.632	0.632	0.65	0.65	0.668
Magnetic Permeability (1 = non-magnetic)	mu	>7.0	1.03	7.00	1.03	3.0	5.0	1.03	3.0
Modulus of Elasticity	Msi	40	40	45	45	45	50	50	53
	Gpa	276	276	310	310	310	345	345	365
Tensile of Strenth	Ksi	120	110	120	110	125	120	110	115
	Mpa	827	758	827	758	862	827	758	793
Yield of Strength	Ksi	85	90	90	85	90	90	85	85
0.2% offset	Mpa	586	620	620	586	620	620	586	586
elongation (1" gage)	%	10	6	12	6	8	8	5	6
Hardness	HRC	26	25	27	26	30	28	27	30
Thermal Expansion Coefficient (20-400 C) (x 10E-6/C)		6.00	6.00	5.75	5.75	5.75	5.50	5.50	5.25
Electrical conductivity (%IACS)		12	14	13	15	10	14	16	16
Thermal conductivity (CGS Units)		0.19	0.22	0.21	0.24	0.26	0.24	0.27	0.29
Specification		Class 1	Class 1	Class 2	Class 2	-------	Class 3	Class 3	Class 4
Composition**		90% W	90% W	92.5% W	92.5% W	95% W, Mo	95% W	95% W	97% W
		bal. Fe,Ni, Cu	bal. Ni, Cu	bal. Fe,Ni, Cu	bal. Ni, Cu	bal. Ni, Fe	bal. Fe,Ni, Cu	bal. Ni, Cu	bal. Fe,Ni, Cu

* properties are those derived per 21014D procedures-from MPA bars; properties are less for thicker section

** can also include Co and other minor elements