85-platinum 15-iridium vs. ASTM B477 Au-Ni-Ag
Both 85-platinum 15-iridium and ASTM B477 Au-Ni-Ag are otherwise unclassified metals. There are 19 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is 85-platinum 15-iridium and the bottom bar is ASTM B477 Au-Ni-Ag.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 95 |
| Elongation at Break, % | 5.5 to 34 | |
| 5.5 to 11 |
| Poisson's Ratio | 0.38 | |
| 0.41 |
| Shear Modulus, GPa | 81 | |
| 34 |
| Shear Strength, MPa | 370 to 420 | |
| 190 to 320 |
| Tensile Strength: Ultimate (UTS), MPa | 560 to 730 | |
| 310 to 550 |
Thermal Properties
| Latent Heat of Fusion, J/g | 110 | |
| 80 |
| Melting Completion (Liquidus), °C | 1820 | |
| 1010 |
| Melting Onset (Solidus), °C | 1790 | |
| 930 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 160 |
| Thermal Expansion, µm/m-K | 8.4 | |
| 15 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 6.2 | |
| 14 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.6 | |
| 7.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 22 | |
| 17 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.7 | |
| 3.1 |
| Stiffness to Weight: Bending, points | 9.3 | |
| 8.9 |
| Strength to Weight: Axial, points | 7.1 to 9.3 | |
| 5.0 to 9.0 |
| Strength to Weight: Bending, points | 6.9 to 8.3 | |
| 6.0 to 8.8 |
| Thermal Shock Resistance, points | 21 to 28 | |
| 16 to 28 |
Alloy Composition
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| Gold (Au), % | 0 | |
| 74.2 to 75.8 |
| Iridium (Ir), % | 14.5 to 15.5 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 2.6 to 3.4 |
| Platinum (Pt), % | 84.3 to 85.5 | |
| 0 |
| Silver (Ag), % | 0 | |
| 21.4 to 22.6 |
| Residuals, % | 0 to 0.2 | |
| 0 to 0.3 |