For more than 30 years used worldwide for hollow jewellery
The gold-silver electrolyte AURUNA® 568 EF-18 stands for decades of Umicore experience in electroforming with mandrels made of wax and metal.
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For more than 30 years used worldwide for hollow jewellery
The gold-silver electrolyte AURUNA® 568 EF-18 stands for decades of Umicore experience in electroforming with mandrels made of wax and metal.
For more than 30 years hollow jewellery has been produced worldwide with AURUNA® 568 EF-18. Among others, renown manufacturers produce creole earrings, pendants, brooches, chains, chain clasps and bangles, but also statues and watch parts with AURUNA® 568 EF-18.
The electrolyte convinces with layer thicknesses of 150 to 200 micrometer, a fine gold content of 18 ct and is easy to maintain. The weight distribution can be monitored within narrow limits very closely.
Electrolyte characteristics
| Electrolyte type | Alkaline-cyanide |
Metal content | 15 g/l Au, 3 g/l Ag |
| pH value | 10.0 - 10.2 (at 45 °C) |
| Operating temperature | 45 °C |
| Current density range | 0.6 - 2.0 A/dm² |
| Plating speed | Approx. 60 μm/h at 1.5 A/dm² |
| Anode material | Pt-Ti (Typ PLATINODE® Pt/Ti) |
Coating characteristics
| Coating | Gold-silver |
| Alloy composition | 77 wt. % Au 23 wt. % Ag |
| Caratage | Approx. 18.5 carats |
| Colour of deposit | Pale yellow |
| Brightness | Semi-bright |
| Hardness | 220 HV |
| Max. coating thickness | Several 100 μm |
| Density of the coating | Approx. 15.8 g/cm³ |
Advantages
- Gold-silver electrolyte for electroforming
- Suitable for cores made of wax and metal
- Layer thicknesses of 150 to 200 micrometer
- Observance of fineness and weight distribution within narrow limits
- High hardness of about 220 HV
Applications
- Electroforming
- Hollow jewellery
