Quarter-Hard Commercially Pure Silver
Quarter-hard silver is commercially pure silver in the quarter-hard temper. The graph bars on the material properties cards below compare quarter-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
4.6 %
Poisson's Ratio
0.37
Shear Modulus
26 GPa 3.8 x 106 psi
Shear Strength
130 MPa 19 x 103 psi
Tensile Strength: Ultimate (UTS)
230 MPa 34 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
6.1 points
Strength to Weight: Bending
8.0 points
Thermal Diffusivity
170 mm2/s
Thermal Shock Resistance
12 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