Annealed 85-platinum 15-iridium vs. Annealed ASTM B541
Both annealed 85-platinum 15-iridium and annealed ASTM B541 are otherwise unclassified metals. Both are furnished in the annealed condition. There are 19 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is annealed 85-platinum 15-iridium and the bottom bar is annealed ASTM B541.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 110 |
| Elongation at Break, % | 34 | |
| 14 |
| Poisson's Ratio | 0.38 | |
| 0.4 |
| Shear Modulus, GPa | 81 | |
| 38 |
| Shear Strength, MPa | 370 | |
| 410 |
| Tensile Strength: Ultimate (UTS), MPa | 560 | |
| 670 |
Thermal Properties
| Latent Heat of Fusion, J/g | 110 | |
| 90 |
| Melting Completion (Liquidus), °C | 1820 | |
| 1110 |
| Melting Onset (Solidus), °C | 1790 | |
| 930 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 170 |
| Thermal Expansion, µm/m-K | 8.4 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 6.2 | |
| 7.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.6 | |
| 4.0 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 17 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.7 | |
| 3.4 |
| Stiffness to Weight: Bending, points | 9.3 | |
| 9.0 |
| Strength to Weight: Axial, points | 7.1 | |
| 11 |
| Strength to Weight: Bending, points | 6.9 | |
| 9.8 |
| Thermal Shock Resistance, points | 21 | |
| 36 |
Alloy Composition
| Copper (Cu), % | 0 | |
| 13.5 to 15.5 |
| Gold (Au), % | 0 | |
| 70.5 to 72.5 |
| Iridium (Ir), % | 14.5 to 15.5 | |
| 0 |
| Platinum (Pt), % | 84.3 to 85.5 | |
| 8.0 to 9.0 |
| Silver (Ag), % | 0 | |
| 4.0 to 5.0 |
| Zinc (Zn), % | 0 | |
| 0.7 to 1.3 |
| Residuals, % | 0 | |
| 0 to 0.4 |