RHODUNA® PT Rhodium-Platinum-Electrolyte

Irresistible – Rhodium with the allure of platinum

Rhodium creates a brilliant white surface on decorative products. Platinum has enjoyed an incredibly stable price for a number of years, and its name is desirable for all buyer groups. Imagine an alloy that combines the benefits of both precious metals.

A RHODUNA® PT layer is built up of rhodium and platinum one half each, notwithstanding that the high-quality alloy can not be distinguished from that of a pure rhodium electrolyte, even with a trained eye. Due to the high societal significance of platinum, your product also gains in psychological value and its price acceptance increases significantly – conversely, for you as a producer a coating with RHODUNA® PT is more attractively in price than that with a pure rhodium electrolyte.

Further information

Electrolyte characteristics

Electrolyte type

Strongly acidic

Metal content

1,5 (0,8 - 1,8) g/l Rh
0,6 (0,4 - 0,8 ) g/l Pt

pH value

< 1

Operating temperature

45 (40 - 50) °C

Current density range

3,0 (2,0 - 4,0) A/dm²

Plating speed

ca. 0,1 μm/min
3 A/dm²

Anode material

MMO (type PLATINODE® 187 SO)

Coating characteristics



Alloy composition

50 % Rh
50 % Pt

Colour of deposit




Hardness of deposit

600 HV

Max. coating thickness

up to 3 μm

Density of the coating

Approx. 15,7 g/cm³


  • White and bright rhodium-platinum coatings
  • Uniform layer thickness
  • Crack-free up to 3 μm
  • Wide current density range
  • Abrasion-resistant
  • Less expensive than pure rhodium layers
  • Minor porosity and good throwing power
  • Good covering speed
  • For rack and barrel plating


  • Jewellery
  • Watches
  • Writing implements
  • Eyeglasses
  • Fittings

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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
Email: chemistry@umicore.com
Website: www.chemistry.umicore.com

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.