90-platinum 10-iridium vs. ASTM B522 Class I
Both 90-platinum 10-iridium and ASTM B522 class I are otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is 90-platinum 10-iridium and the bottom bar is ASTM B522 class I.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 96 |
| Elongation at Break, % | 5.5 to 34 | |
| 1.1 to 29 |
| Poisson's Ratio | 0.38 | |
| 0.41 |
| Shear Modulus, GPa | 74 | |
| 34 |
| Shear Strength, MPa | 220 to 320 | |
| 180 to 280 |
| Tensile Strength: Ultimate (UTS), MPa | 330 to 550 | |
| 280 to 490 |
Thermal Properties
| Latent Heat of Fusion, J/g | 100 | |
| 77 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 160 |
| Thermal Expansion, µm/m-K | 8.6 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 17 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.3 | |
| 3.1 |
| Stiffness to Weight: Bending, points | 9.1 | |
| 8.9 |
| Strength to Weight: Axial, points | 4.2 to 7.1 | |
| 4.4 to 7.8 |
| Strength to Weight: Bending, points | 4.9 to 6.9 | |
| 5.5 to 8.0 |
| Thermal Shock Resistance, points | 13 to 22 | |
| 13 to 24 |
Alloy Composition
| Gold (Au), % | 0 | |
| 68 to 70 |
| Iridium (Ir), % | 9.5 to 10.5 | |
| 0 |
| Platinum (Pt), % | 89.3 to 90.5 | |
| 5.0 to 7.0 |
| Silver (Ag), % | 0 | |
| 23.5 to 26.5 |
| Residuals, % | 0 | |
| 0 to 0.35 |