ASTM B522 Class I vs. 85-platinum 15-iridium
Both ASTM B522 class I and 85-platinum 15-iridium are otherwise unclassified metals. There are 19 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is ASTM B522 class I and the bottom bar is 85-platinum 15-iridium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 96 | |
| 220 |
| Elongation at Break, % | 1.1 to 29 | |
| 5.5 to 34 |
| Poisson's Ratio | 0.41 | |
| 0.38 |
| Shear Modulus, GPa | 34 | |
| 81 |
| Shear Strength, MPa | 180 to 280 | |
| 370 to 420 |
| Tensile Strength: Ultimate (UTS), MPa | 280 to 490 | |
| 560 to 730 |
Thermal Properties
| Latent Heat of Fusion, J/g | 77 | |
| 110 |
| Melting Completion (Liquidus), °C | 1030 | |
| 1820 |
| Melting Onset (Solidus), °C | 1030 | |
| 1790 |
| Specific Heat Capacity, J/kg-K | 160 | |
| 130 |
| Thermal Expansion, µm/m-K | 15 | |
| 8.4 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 11 | |
| 6.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 5.8 | |
| 2.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 22 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.1 | |
| 5.7 |
| Stiffness to Weight: Bending, points | 8.9 | |
| 9.3 |
| Strength to Weight: Axial, points | 4.4 to 7.8 | |
| 7.1 to 9.3 |
| Strength to Weight: Bending, points | 5.5 to 8.0 | |
| 6.9 to 8.3 |
| Thermal Shock Resistance, points | 13 to 24 | |
| 21 to 28 |
Alloy Composition
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| Gold (Au), % | 68 to 70 | |
| 0 |
| Iridium (Ir), % | 0 | |
| 14.5 to 15.5 |
| Platinum (Pt), % | 5.0 to 7.0 | |
| 84.3 to 85.5 |
| Silver (Ag), % | 23.5 to 26.5 | |
| 0 |
| Residuals, % | 0 to 0.35 | |
| 0 to 0.2 |