AURUNA® 3407 EF Gold Electrolyte for Electroforming

Cyanid-free gold electrolyte

AURUNA® 3407 EF is cyanide free and mainly used for electroforming with wax and metal cores. The electrolyte allows to produce high-quality hollow jewellery with thick gold layers between 150 and 200 micrometer on mandrels made conductive.

The layers have an excellent hardness up to 160 HV and a fineness of 99.9 percent. Therefore, the produced pieces are very stable in use. The surfaces are semi-bright and show good quality. They can easily be polished as well as soldered.

The electrolyte convinces user dues to an additional surplus. It does not contain any toxic additives as grain refiners like arsenic, thallium or lead.

Electrolyte characteristics

Electrolyte type


Metal content

20 (19 - 21) g/l Au

pH value

8.2 (8.0 - 8.4)

Operating temperature

35 (30 - 40) °C

Current density range

0.3 A/dm²

Plating speed

Approx. 0.2 μm/min at 0.3 A/dm²

Deposition rate

Approx. 122 mg/Amin

Anode material

Pt-Ti (Typ PLATINODE® Pt-Ti)

Current efficiency

Approx. 90 %

Coating characteristics


Fine gold


24 carats


99.9 wt. % Au

Colour of deposit





Approx. 160 HV

Max. coating thickness

Several 100 μm

Density of the coating

Approx. 19.3 g/cm³


  • Cyanide-free gold electrolyte for the production of hollow jewellery
  • Suitable for mandrels made of wax and metal
  • Layer thicknesses of 150 to 200 micrometers, hardness up to 160 HV
  • No arsenic, thallium or lead as grain refiner


  • 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.