85-platinum 15-iridium vs. 90-platinum 10-iridium
Both 85-platinum 15-iridium and 90-platinum 10-iridium are otherwise unclassified metals. They have a very high 95% of their average alloy composition in common. There are 15 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is 85-platinum 15-iridium and the bottom bar is 90-platinum 10-iridium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 200 |
| Elongation at Break, % | 5.5 to 34 | |
| 5.5 to 34 |
| Poisson's Ratio | 0.38 | |
| 0.38 |
| Shear Modulus, GPa | 81 | |
| 74 |
| Shear Strength, MPa | 370 to 420 | |
| 220 to 320 |
| Tensile Strength: Ultimate (UTS), MPa | 560 to 730 | |
| 330 to 550 |
Thermal Properties
| Latent Heat of Fusion, J/g | 110 | |
| 100 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 130 |
| Thermal Expansion, µm/m-K | 8.4 | |
| 8.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 22 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.7 | |
| 5.3 |
| Stiffness to Weight: Bending, points | 9.3 | |
| 9.1 |
| Strength to Weight: Axial, points | 7.1 to 9.3 | |
| 4.2 to 7.1 |
| Strength to Weight: Bending, points | 6.9 to 8.3 | |
| 4.9 to 6.9 |
| Thermal Shock Resistance, points | 21 to 28 | |
| 13 to 22 |
Alloy Composition
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| Iridium (Ir), % | 14.5 to 15.5 | |
| 9.5 to 10.5 |
| Platinum (Pt), % | 84.3 to 85.5 | |
| 89.3 to 90.5 |
| Residuals, % | 0 to 0.2 | |
| 0 to 0.2 |