Gobright® TWX-40 Gold Electrolyte

Semi autocatalytic gold electrolyte

Gobright® TWX-40 is a special gold electrolyte specifically designed for plating on electroless palladium deposits. The electrolyte is able to deposit uniform gold layers up to 0.3 μm independent of pad sizes and PCB surface potential. Due to its semi autocatalytic reaction corrosive attack on the intermediate nickel layer is almost excluded. As a result an improvement in solder joint reliability and gold wire bondability can be achieved.

Electrolyte characteristics

Electrolyte type

Semi autocatalytic

Metal content

1.2 (1.0 - 1.4) g/l Au

pH value

7.1 (6.9 - 7.4)

Operating temperature

78 (76 - 84) °C

Plating speed

0.12 μm/15 min at 78°C

Coating characteristics


Fine gold


99.9 wt.%

Colour of deposit



  • Can be used for different solderable and bondable PCB final finishes: ENEPIG, ENIG, EPIG and ISIG
  • Does not cause Ni corrosion, even with higher gold layer thicknesses
  • Homogeneous perfect gold thickness distribution, independent of circuit layout and potential
  • Excellent solder joint reliability
  • Very good gold wire bondability
  • Can be directly deposited on nickel or palladium without intermediate activation


  • LED application
  • Medical technology
  • Aerospace technology

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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.