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
