Plasma treatment before Conformal Coating extends the process window and ensures perfect quality

With electronic components increasingly being used in less controllable environments, the demand for (corrosion) protection is growing. From vehicle interiors and engine compartments in automotive to military and aerospace equipment – the use of a conformal coating to protect the electronics is now virtually imperative. This is the only way to safely ensure the required performance and reliability for the entire life of the PCB and beyond.
Pretreatment with Openair-Plasma® facilitates the complex process of conformal coating by extending the process window and increasing the quality of the coating.

Coating challenges

Common issues in the conformal coating process are orange peel, bubbles, delamination, uneven coatings and cracks. These may be caused by the coating material, the circuit board, the component quality, the oven profile, impurities or even the application process.

The solution – Openair-Plasma®

Pretreatment with Openair-Plasma® will help to eleminate these challenges and ensures a high quality and reliable end product. Increased surface energy allows the coating material to flow more evenly and prevents the formation of bubbles. Improved adhesion of the coating combined with plasma fine-cleaning safely prevents delamination or dewetting.


of Openair-Plasma® technology

  • Selective: switch on and off on the fly
  • Environmentally friendly: no wet chemicals required
  • Cost-effective: operates with oil-free compressed air
  • In-line capability: no effect on process time because the plasma process takes less time than the conformal coating process

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