RHODUNA® PT Rhodium-Platinum-Electrolyte

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.

Alternatively, the alloy composition of rhodium and platinum can be variably adjusted. Compositions of 80 % platinum to 20 % rhodium, and vice versa, are possible - and all this with constant layer properties. Therefore you always have the price advantage on your side.

Further information

Electrolyte characteristics

Electrolyte type

Strongly acidic

Metal content

0,6 - 1,5 g/l Rh, 0,6 - 1,5 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

20 - 80 % Rh, 20 - 80 % Pt

Colour of deposit




Hardness of deposit

600 HV (at 50 % Rh and 50 % Pt)

Max. coating thickness

up to 0,3 μm

Density of the coating

Approx. 15,7 g/cm³ (at 50 % Rh and 50 % Pt)


  • White and bright rhodium-platinum coatings
  • Uniform layer thickness
  • Crack-free up to 0,3 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


  • Produktblatt_RHODUNA_PT_EN_Screen.pdf

Your contact person

Markus Legeler

Manager Sales International
T: +49 7171 607 204
F: +49 7171 607 316

Find a representative in your region


      Umicore uses certain monitoring and tracking technologies such as cookies. These technologies are used in order to maintain, provide and improve our services on an ongoing basis, and in order to provide our web visitors with a better experience.

      By clicking on the "Accept all" button you agree to the use of these cookies while using the website. For further information regarding how we use cookies and other tracking technologies, please see section 11 of our website privacy notice

          Necessary cookies are essential and help you navigate our website. This helps to support security and basic functionality and are necessary for the proper operation of our website, so if you block these cookies we cannot guarantee your use or the security during your visit.

          Cookies that help us to understand the behaviour of users of our website. This allows us to continuously improve our website to provide the best information in support of our project aims. These cookies also help us understand the effectiveness of our website. For instance these cookies tell us which pages visitors go to most often and if they get error messages from web pages.

          Cookies that deliver content to you based on your interests, which are assumed from your browsing history. Most Targeting Cookies track users via their IP address and, thus, may collect some Personal Data. Personal Data collected by Targeting Cookies may be shared with third parties, such as advertisers.