AURUNA® 568 EF-18 Gold-Silver Electrolyte for Electroforming

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


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



Alloy composition

77 wt. % Au
23 wt. % Ag


Approx. 18.5 carats

Colour of deposit

Pale yellow




220 HV

Max. coating thickness

Several 100 μm

Density of the coating

Approx. 15.8 g/cm³


  • 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


  • Electroforming
  • Hollow jewellery
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Questions about the product?

Markus Legeler

+49 7171 607 204

For inquiries and additional information
please contact

Umicore AG & Co. KG
Rodenbacher Chaussee 4
63457 Hanau-Wolfgang

Tel.: +49 (6181) 59 6005
Fax: +49 (6181) 59 2970

The information and statements contained herein are provided free of charge. They are believed to be accurate at the time of publication, but Umicore makes no warranty with respect thereto, including but not limited to any results to be obtained or the infringement of any proprietary rights. Use or application of such information or statements is at the user´s sole discretion, without any liability on the part of Umicore. Nothing herein shall be construed as a license or recommendation for use, which infringes upon any proprietary rights. All sales are subject to Umicore´s General Conditions of Sale and Delivery.