Low-Density Pressed and Sintered ASTM B631 Class C Silver-Tungsten Alloy
Low-density ASTM B631 class C is a type of ASTM B631 class C. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. The graph bars on the material properties cards below compare low-density ASTM B631 class C to: precious metal electrical contact 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
180 GPa 26 x 106 psi
Poisson's Ratio
0.32
Rockwell B Hardness
43
Shear Modulus
67 GPa 9.7 x 106 psi
Thermal Properties
Latent Heat of Fusion
140 J/g
Specific Heat Capacity
180 J/kg-K 0.044 BTU/lb-°F
Thermal Conductivity
490 W/m-K 290 BTU/h-ft-°F
Thermal Expansion
14 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
55 % IACS
Electrical Conductivity: Equal Weight (Specific)
37 % IACS
Otherwise Unclassified Properties
Density
13 g/cm3 830 lb/ft3
Embodied Carbon
59 kg CO2/kg material
Embodied Energy
920 MJ/kg 400 x 103 BTU/lb
Common Calculations
Stiffness to Weight: Axial
7.4 points
Stiffness to Weight: Bending
14 points
Thermal Diffusivity
200 mm2/s
Alloy Composition
| W | 47.1 to 54 | |
| Ag | 46 to 52 | |
| C | 0 to 0.2 | |
| Cu | 0 to 0.2 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B631: Standard Specification for Silver-Tungsten Electrical Contact Materials
Tungsten: Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds, Erik Lassner and Wolf-Dieter Schubert, 1999