Annealed 85-platinum 15-iridium vs. Annealed ASTM B617
Both annealed 85-platinum 15-iridium and annealed ASTM B617 are otherwise unclassified metals. Both are furnished in the annealed condition. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is annealed 85-platinum 15-iridium and the bottom bar is annealed ASTM B617.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 75 |
| Elongation at Break, % | 34 | |
| 22 |
| Poisson's Ratio | 0.38 | |
| 0.37 |
| Shear Modulus, GPa | 81 | |
| 28 |
| Shear Strength, MPa | 370 | |
| 180 |
| Tensile Strength: Ultimate (UTS), MPa | 560 | |
| 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 110 | |
| 120 |
| Melting Completion (Liquidus), °C | 1820 | |
| 870 |
| Melting Onset (Solidus), °C | 1790 | |
| 780 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 250 |
| Thermal Expansion, µm/m-K | 8.4 | |
| 19 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 6.2 | |
| 83 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.6 | |
| 72 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 10 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.7 | |
| 4.1 |
| Stiffness to Weight: Bending, points | 9.3 | |
| 14 |
| Strength to Weight: Axial, points | 7.1 | |
| 7.7 |
| Strength to Weight: Bending, points | 6.9 | |
| 9.3 |
| Thermal Shock Resistance, points | 21 | |
| 14 |
Alloy Composition
Deprecated: Automatic conversion of false to array is deprecated in /home/public/compare.php on line 452
| Aluminum (Al), % | 0 | |
| 0 to 0.0050 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.050 |
| Copper (Cu), % | 0 | |
| 9.0 to 10.4 |
| Iridium (Ir), % | 14.5 to 15.5 | |
| 0 |
| Iron (Fe), % | 0 | |
| 0 to 0.050 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Nickel (Ni), % | 0 | |
| 0 to 0.010 |
| Phosphorus (P), % | 0 | |
| 0 to 0.020 |
| Platinum (Pt), % | 84.3 to 85.5 | |
| 0 |
| Silver (Ag), % | 0 | |
| 89.6 to 91 |
| Zinc (Zn), % | 0 | |
| 0 to 0.060 |
| Residuals, % | 0 to 0.2 | |
| 0 to 0.060 |