A surface is wettable if a liquid applied to it can wet the surface. A surface can be wettable for liquids with low surface tension, but not for others whose surface tension is higher than the surface energy of the surface. To ensure successful gluing, painting or printing of a surface, it must be wettable by the glue, paint, or ink. If necessary, the surface energy must be increased by plasma treatment. zu erhöhen. See ⇒Increase wettability.
To make a surface self-cleaning or fast-drying or a textile fabric waterproof, the surface energy must be reduced until it is smaller than the surface tension of water (72 mN/m). The same is true for reducing the surface friction of a workpiece moving in the water to a minimum (for hulls, swim wear). A reduction of the surface tension can be primarily achieved by plasma coating. erzielen. See ⇒Reduce wettability