Technical Data Sheets

Tungsten Material Reference Data

Typical reference values for pure tungsten and tungsten heavy alloy (WHA) produced by Tungsten Parts Wyoming. Values are representative for each material class. Certified properties for a specific order are provided on the Certificate of Conformance and vary by grade, size, and processing.

Pure Tungsten (W): Typical Properties

Density	19.25 g/cm³ (0.695 lb/in³)
Melting point	3,422 °C (6,192 °F), the highest of any metal
Boiling point	approx. 5,555 °C (10,031 °F)
Thermal conductivity	173 W/m·K
Thermal expansion (CTE)	4.5 µm/m·°C at 20 °C
Modulus of elasticity	411 GPa
Electrical resistivity	5.6 µΩ·cm at 20 °C
Specific heat	134 J/kg·K
Atomic number / weight	74 / 183.84 g/mol

Tungsten Heavy Alloy (WHA): ASTM B777 Grades

Class	Tungsten content	Nominal density	Binder system
Class 1	90% W	17.0 g/cm³	Ni-Fe or Ni-Cu
Class 2	92.5% W	17.5 g/cm³	Ni-Fe or Ni-Cu
Class 3	95% W	18.0 g/cm³	Ni-Fe or Ni-Cu
Class 4	97% W	18.5 g/cm³	Ni-Fe or Ni-Cu

Nickel-copper binders are used for non-magnetic applications. Density rises with tungsten content, reaching up to about 18.8 g/cm³.

Density and Hardness by ASTM B777 Class

Class	Tungsten content	Density range	Hardness, max (Rockwell C)
Class 1	90% W	16.85 to 17.30 g/cm³	32
Class 2	92.5% W	17.15 to 17.85 g/cm³	33
Class 3	95% W	17.75 to 18.35 g/cm³	34
Class 4	97% W	18.25 to 18.85 g/cm³	35

ASTM B777 Tensile Properties, Minimum Values

Class	Ultimate strength, standard	0.2% offset yield, standard	Elongation, standard	Ultimate strength, nonmagnetic
Class 1	758 MPa	517 MPa	5%	648 MPa
Class 2	758 MPa	517 MPa	5%	648 MPa
Class 3	724 MPa	517 MPa	3%	648 MPa
Class 4	689 MPa	517 MPa	2%	not produced nonmagnetic

These are ASTM B777 minimum requirements. Nonmagnetic alloys substitute a nickel-copper binder for nickel-iron; Class 4 is not produced in the nonmagnetic system.

TPW Certified Performance, Class 2 and Class 4

Material we ship regularly tests above these ASTM B777 minimums. Typical certified values from our own lot testing:

Property	TPW Class 2	TPW Class 4
Density	17.5 to 17.7 g/cm³	18.4 to 18.6 g/cm³
Ultimate tensile strength	895 MPa	885 MPa
0.2% offset yield	640 MPa	625 MPa
Elongation	30%	16%
Charpy impact	104 J	not tested
Hardness	25 Rockwell C	not tested

Class 2 elongation of 30 percent runs six times the 5 percent ASTM minimum, and ultimate tensile strength sits well above the 758 MPa floor. That margin gives the material room to deform under load instead of fracturing, and the 104 J Charpy result clears a common industry reference point of 90 J.

Density Comparison

Material	Density	Relative to tungsten
Pure tungsten	19.25 g/cm³	1.00x
Tungsten heavy alloy	17.0 to 18.8 g/cm³	0.88 to 0.98x
Lead	11.34 g/cm³	0.59x
Steel	7.85 g/cm³	0.41x

Tungsten carries roughly 1.7 times the mass of lead and 2.5 times the mass of steel for the same volume, which is why it is chosen for counterweights, ballast, and radiation shielding where space is limited.

Applicable Standards

ASTM B777 (tungsten base, high-density metal) and AMS 7725 (tungsten alloy), plus customer and program specifications. Material can be certified to DFARS 252.225-7052 on a per-program basis (effective January 1, 2027).

For a certified data sheet on a specific grade or part, contact our engineering team.