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Class 1 Tungsten

Class 1 tungsten is a tungsten alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a very low heat capacity among alloys in the same category. In addition, it has a very high tensile strength and a fairly high density.

The graph bars on the material properties cards below compare class 1 tungsten to: tungsten alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

250 GPa 37 x 106 psi

Elongation at Break

5.7 %

Poisson's Ratio


Rockwell C Hardness


Shear Modulus

98 GPa 14 x 106 psi

Tensile Strength: Ultimate (UTS)

860 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

580 MPa 84 x 103 psi

Thermal Properties

Latent Heat of Fusion

160 J/g

Specific Heat Capacity

120 J/kg-K 0.028 BTU/lb-°F

Thermal Conductivity

21 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

5.1 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

12 % IACS

Electrical Conductivity: Equal Weight (Specific)

7.4 % IACS

Otherwise Unclassified Properties


15 g/cm3 910 lb/ft3

Embodied Carbon

22 kg CO2/kg material

Embodied Energy

340 MJ/kg 150 x 103 BTU/lb

Embodied Water

140 L/kg 17 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

44 MJ/m3

Resilience: Unit (Modulus of Resilience)

660 kJ/m3

Stiffness to Weight: Axial

9.6 points

Stiffness to Weight: Bending

14 points

Strength to Weight: Axial

16 points

Strength to Weight: Bending

14 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

48 points

Alloy Composition

Tungsten (W)W 90 to 90
Residualsres. 10 to 10

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B777: Standard Specification for Tungsten Base, High-Density Metal

Tungsten: Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds, Erik Lassner and Wolf-Dieter Schubert, 1999