18K Yellow Gold (Au-12.5Cu-12.5Ag) vs Pure Silver (Ag 99.9%)
Property comparison of 18K Yellow Gold (Au-12.5Cu-12.5Ag) and Pure Silver (Ag 99.9%), both precious metal.
| Property | 18K Yellow Gold (Au-12.5Cu-12.5Ag) | Pure Silver (Ag 99.9%) | Difference |
|---|---|---|---|
| Tensile strength | 300 MPa | 125 MPa | -58% |
| Elastic modulus | 75,000 MPa | 71,000 MPa | -5% |
| Density | 15,500 kg/m³ | 10,490 kg/m³ | -32% |
| Thermal conductivity | 320 W/m·K | 428 W/m·K | +34% |
| Specific heat | 200 J/kg·K | 235 J/kg·K | +18% |
| Coefficient of thermal expansion | 0.000014 1/K | 0.00002 1/K | +38% |
| Melting point | 912 °C | 962 °C | +5% |
Difference is Pure Silver (Ag 99.9%) 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
- fine silver
- standard
- ESPI Metals technical data / NBS Circular 412
- heat treatment
- annealed
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