Annealed 85-platinum 15-iridium vs. Annealed R05200 Tantalum
Both annealed 85-platinum 15-iridium and annealed R05200 tantalum are otherwise unclassified metals. Both are furnished in the annealed condition. There are 15 material properties with values for both materials. Properties with values for just one material (10, 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 R05200 tantalum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 34 | |
| 28 |
| Poisson's Ratio | 0.38 | |
| 0.34 |
| Shear Modulus, GPa | 81 | |
| 69 |
| Tensile Strength: Ultimate (UTS), MPa | 560 | |
| 210 |
Thermal Properties
| Latent Heat of Fusion, J/g | 110 | |
| 140 |
| Melting Completion (Liquidus), °C | 1820 | |
| 3020 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 140 |
| Thermal Expansion, µm/m-K | 8.4 | |
| 6.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 17 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.7 | |
| 6.2 |
| Stiffness to Weight: Bending, points | 9.3 | |
| 11 |
| Strength to Weight: Axial, points | 7.1 | |
| 3.6 |
| Strength to Weight: Bending, points | 6.9 | |
| 4.8 |
| Thermal Shock Resistance, points | 21 | |
| 13 |
Alloy Composition
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| Carbon (C), % | 0 | |
| 0 to 0.010 |
| Hydrogen (H), % | 0 | |
| 0 to 0.0015 |
| Iridium (Ir), % | 14.5 to 15.5 | |
| 0 |
| Iron (Fe), % | 0 | |
| 0 to 0.010 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.020 |
| Nickel (Ni), % | 0 | |
| 0 to 0.010 |
| Niobium (Nb), % | 0 | |
| 0 to 0.1 |
| Nitrogen (N), % | 0 | |
| 0 to 0.010 |
| Oxygen (O), % | 0 | |
| 0 to 0.015 |
| Platinum (Pt), % | 84.3 to 85.5 | |
| 0 |
| Silicon (Si), % | 0 | |
| 0 to 0.0050 |
| Tantalum (Ta), % | 0 | |
| 99.8 to 100 |
| Titanium (Ti), % | 0 | |
| 0 to 0.010 |
| Tungsten (W), % | 0 | |
| 0 to 0.050 |
| Residuals, % | 0 to 0.2 | |
| 0 |