1/8-Hard Commercially Pure Silver
1/8-hard silver is commercially pure silver in the 1/8-hard temper. It has the second lowest strength and second highest ductility compared to the other variants of commercially pure silver.
The graph bars on the material properties cards below compare 1/8-hard silver 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
71 GPa 10 x 106 psi
Elongation at Break
17 %
Poisson's Ratio
0.37
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
130 MPa 18 x 103 psi
Tensile Strength: Ultimate (UTS)
200 MPa 30 x 103 psi
Thermal Properties
Latent Heat of Fusion
110 J/g
Melting Completion (Liquidus)
960 °C 1760 °F
Melting Onset (Solidus)
960 °C 1760 °F
Specific Heat Capacity
240 J/kg-K 0.056 BTU/lb-°F
Thermal Conductivity
420 W/m-K 240 BTU/h-ft-°F
Thermal Expansion
20 µm/m-K
Other Material Properties
Density
10 g/cm3 650 lb/ft3
Electrical Conductivity: Equal Volume
100 % IACS
Electrical Conductivity: Equal Weight (Specific)
87 % IACS
Common Calculations
Stiffness to Weight: Axial
3.8 points
Stiffness to Weight: Bending
13 points
Strength to Weight: Axial
5.4 points
Strength to Weight: Bending
7.3 points
Thermal Diffusivity
170 mm2/s
Thermal Shock Resistance
10 points
Alloy Composition
| Ag | 99.9 to 100 | |
| res. | 0 to 0.1 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM B742: Standard Specification for Fine Silver Electrical Contact Fabricated Material