Adhesion refers to molecular interactions between the contact surfaces of different substances. These interactions are also known as adhesion forces.
They can be observed, for example, when paint adheres to paper or when two workpieces are glued together. In contrast to adhesion, cohesion refers to the forces that act between the molecules of a single substance.
Based on the relationship between the forces of adhesion and cohesion, liquids exhibit different wetting behavior in connection with a solid surface.
#1 Definition of adhesion
Adhesion is the adhesion of the interfaces of two substances. The mechanical cohesion is generated by molecular interactions between the two substances (adhesion forces).
#2 Importance of adhesion
In sealing technology, adhesion determines the strength of the bond between elastomer surfaces or with insert materials.
This is important, for example, when gluing O-rings made from a round cord. In addition, high adhesion of the O-ring material creates a softer surface so that small irregularities in sealing surfaces are better filled.