ARGUNA® 621 EF Bright Silver Electrolyte for Electroforming

For noble silver hollow jewellery

ARGUNA® 621 EF is a silver electrolyte, especially to produce noble hollow jewellery. A layer with high thickness can be deposited on mandrels made conductive.

The electrolyte works with wax and metal cores. It can be used within a wide current density range and is suitable for relatively high temperature ranges (40 degrees Celsius).

Its good throwing power results in a uniform layer thickness distribution. The surfaces are bright and brilliant white, without blue cast and have a fineness of 99.9 percent silver.

Electrolyte characteristics

Electrolyte type


Metal content

40 (35 - 45) g/l Ag

pH value

No control required

Operating temperature

40 to max. 45 °C

Current density range

1 - 2 A/dm²

Plating speed

Approx. 0.6 μm/min at 1.0 A/dm²
Approx. 1.2 μm/min at 2.0 A/dm²

Anode material

Fine silver

Coating characteristics


Fine silver

Alloy composition

99.9 wt. % Ag

Colour of deposit

Brilliant white




85 - 185 HV

Max. coating thickness

Several 100 μm

Density of the coating

Approx. 10.5 g/cm³


  • Bright silver electrolyte for producing hollow jewellery on wax and metal cores
  • Suitable for relatively high temperature ranges (40 degrees Celsius)
  • Surfaces are brilliant white
  • Wide current density range
  • Very good throwing power, therefore, uniform thickness distribution


  • 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.