90-platinum 10-iridium vs. 85-platinum 15-iridium
Both 90-platinum 10-iridium and 85-platinum 15-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 90-platinum 10-iridium and the bottom bar is 85-platinum 15-iridium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 5.5 to 34 | |
| 5.5 to 34 |
| Poisson's Ratio | 0.38 | |
| 0.38 |
| Shear Modulus, GPa | 74 | |
| 81 |
| Shear Strength, MPa | 220 to 320 | |
| 370 to 420 |
| Tensile Strength: Ultimate (UTS), MPa | 330 to 550 | |
| 560 to 730 |
Thermal Properties
| Latent Heat of Fusion, J/g | 100 | |
| 110 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 130 |
| Thermal Expansion, µm/m-K | 8.6 | |
| 8.4 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 22 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.3 | |
| 5.7 |
| Stiffness to Weight: Bending, points | 9.1 | |
| 9.3 |
| Strength to Weight: Axial, points | 4.2 to 7.1 | |
| 7.1 to 9.3 |
| Strength to Weight: Bending, points | 4.9 to 6.9 | |
| 6.9 to 8.3 |
| Thermal Shock Resistance, points | 13 to 22 | |
| 21 to 28 |
Alloy Composition
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| Iridium (Ir), % | 9.5 to 10.5 | |
| 14.5 to 15.5 |
| Platinum (Pt), % | 89.3 to 90.5 | |
| 84.3 to 85.5 |
| Residuals, % | 0 to 0.2 | |
| 0 to 0.2 |