Surface Energy – What is it and how do you measure it?

During discussions about common defects in conformal coatings related to surface energy issues such as fish eyes, lack of coating coverage, poor bonding and delamination one of the most common questions we are asked is just what surface energy is anyway.

Surface Energy Vs Surface Tension
Surface chemistry is an enormously complex and cussed branch of the sciences; consequently, we will attempt only a layman’s discussion and understanding here. For the purposes of conformal coating, surface energy must be considered for both the exposed surface of the PCB as well as for the coating itself.  

Commonly when talking about solids, the term SURFACE ENERGY is used, while when considering liquids or coatings, the term SURFACE TENSION is used instead. 

 

BLOG: What is PCB Surface Energy and How Does It Affect Conformal Coating?

Surface chemistry is an enormously complex and cussed branch of the sciences; consequently, we will attempt only a layman’s discussion and understanding here. For the purposes of conformal coating, surface energy must be considered for both the exposed surface of the PCB as well as for the coating itself.

Interview with David Greenman

Director at Humiseal

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