18K Yellow Gold (Au-12.5Cu-12.5Ag) vs Platinum-Rhodium (Pt-10Rh)
Property comparison of 18K Yellow Gold (Au-12.5Cu-12.5Ag) and Platinum-Rhodium (Pt-10Rh), both precious metal.
| Property | 18K Yellow Gold (Au-12.5Cu-12.5Ag) | Platinum-Rhodium (Pt-10Rh) | Difference |
|---|---|---|---|
| Density | 15,500 kg/m³ | 19,970 kg/m³ | +29% |
| Brinell hardness | 80 HB | 90 HB | +13% |
| Thermal conductivity | 320 W/m·K | 38 W/m·K | -88% |
| Coefficient of thermal expansion | 0.000014 1/K | 0.000009 1/K | -40% |
| Melting point | 912 °C | 1,843 °C | +102% |
Difference is Platinum-Rhodium (Pt-10Rh) relative to 18K Yellow Gold (Au-12.5Cu-12.5Ag). Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- 18K yellow
- standard
- Smithells Metals Reference Book 8th Ed.
- heat treatment
- annealed
- grade
- Pt-10Rh Type S thermocouple
- standard
- Goodfellow / AZoM Article ID 2273
- heat treatment
- as-drawn
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