14K Yellow Gold (Au-Cu-Ag-Zn) vs 18K Yellow Gold (Au-12.5Cu-12.5Ag)
Property comparison of 14K Yellow Gold (Au-Cu-Ag-Zn) and 18K Yellow Gold (Au-12.5Cu-12.5Ag), both precious metal.
| Property | 14K Yellow Gold (Au-Cu-Ag-Zn) | 18K Yellow Gold (Au-12.5Cu-12.5Ag) | Difference |
|---|---|---|---|
| Tensile strength | 350 MPa | 300 MPa | -14% |
| Elastic modulus | 68,000 MPa | 75,000 MPa | +10% |
| Density | 13,000 kg/m³ | 15,500 kg/m³ | +19% |
| Brinell hardness | 130 HB | 80 HB | -38% |
| Thermal conductivity | 200 W/m·K | 320 W/m·K | +60% |
| Specific heat | 150 J/kg·K | 200 J/kg·K | +33% |
| Coefficient of thermal expansion | 0.000016 1/K | 0.000014 1/K | -8% |
| Melting point | 880 °C | 912 °C | +4% |
Difference is 18K Yellow Gold (Au-12.5Cu-12.5Ag) relative to 14K Yellow Gold (Au-Cu-Ag-Zn). 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
- 14K yellow
- standard
- Smithells Metals Reference Book 8th Ed.
- heat treatment
- annealed
- grade
- 18K yellow
- standard
- Smithells Metals Reference Book 8th Ed.
- heat treatment
- annealed
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