85-platinum 15-iridium vs. ASTM B617 Coin Silver
Both 85-platinum 15-iridium and ASTM B617 coin silver are otherwise unclassified metals. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is 85-platinum 15-iridium and the bottom bar is ASTM B617 coin silver.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 75 |
| Elongation at Break, % | 5.5 to 34 | |
| 1.1 to 22 |
| Poisson's Ratio | 0.38 | |
| 0.37 |
| Shear Modulus, GPa | 81 | |
| 28 |
| Shear Strength, MPa | 370 to 420 | |
| 180 to 290 |
| Tensile Strength: Ultimate (UTS), MPa | 560 to 730 | |
| 290 to 520 |
Thermal Properties
| Latent Heat of Fusion, J/g | 110 | |
| 120 |
| Melting Completion (Liquidus), °C | 1820 | |
| 870 |
| Melting Onset (Solidus), °C | 1790 | |
| 780 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 250 |
| Thermal Expansion, µm/m-K | 8.4 | |
| 19 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 6.2 | |
| 83 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.6 | |
| 72 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 10 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.7 | |
| 4.1 |
| Stiffness to Weight: Bending, points | 9.3 | |
| 14 |
| Strength to Weight: Axial, points | 7.1 to 9.3 | |
| 7.7 to 14 |
| Strength to Weight: Bending, points | 6.9 to 8.3 | |
| 9.3 to 14 |
| Thermal Shock Resistance, points | 21 to 28 | |
| 14 to 25 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 0 to 0.0050 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.050 |
| Copper (Cu), % | 0 | |
| 9.0 to 10.4 |
| Iridium (Ir), % | 14.5 to 15.5 | |
| 0 |
| Iron (Fe), % | 0 | |
| 0 to 0.050 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Nickel (Ni), % | 0 | |
| 0 to 0.010 |
| Phosphorus (P), % | 0 | |
| 0 to 0.020 |
| Platinum (Pt), % | 84.3 to 85.5 | |
| 0 |
| Silver (Ag), % | 0 | |
| 89.6 to 91 |
| Zinc (Zn), % | 0 | |
| 0 to 0.060 |
| Residuals, % | 0 to 0.2 | |
| 0 to 0.060 |