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
