ASTM B541 Gold vs. 90-platinum 10-iridium
Both ASTM B541 gold and 90-platinum 10-iridium are otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is ASTM B541 gold and the bottom bar is 90-platinum 10-iridium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 200 |
| Elongation at Break, % | 6.0 to 14 | |
| 5.5 to 34 |
| Poisson's Ratio | 0.4 | |
| 0.38 |
| Shear Modulus, GPa | 38 | |
| 74 |
| Shear Strength, MPa | 410 to 690 | |
| 220 to 320 |
| Tensile Strength: Ultimate (UTS), MPa | 670 to 1180 | |
| 330 to 550 |
Thermal Properties
| Latent Heat of Fusion, J/g | 90 | |
| 100 |
| Specific Heat Capacity, J/kg-K | 170 | |
| 130 |
| Thermal Expansion, µm/m-K | 13 | |
| 8.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 22 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.4 | |
| 5.3 |
| Stiffness to Weight: Bending, points | 9.0 | |
| 9.1 |
| Strength to Weight: Axial, points | 11 to 19 | |
| 4.2 to 7.1 |
| Strength to Weight: Bending, points | 9.8 to 14 | |
| 4.9 to 6.9 |
| Thermal Shock Resistance, points | 36 to 63 | |
| 13 to 22 |
Alloy Composition
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| Copper (Cu), % | 13.5 to 15.5 | |
| 0 |
| Gold (Au), % | 70.5 to 72.5 | |
| 0 |
| Iridium (Ir), % | 0 | |
| 9.5 to 10.5 |
| Platinum (Pt), % | 8.0 to 9.0 | |
| 89.3 to 90.5 |
| Silver (Ag), % | 4.0 to 5.0 | |
| 0 |
| Zinc (Zn), % | 0.7 to 1.3 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 to 0.2 |