When buying various types of repair and construction materials, the word "adhesion" very often slips through and less often, but "cohesion" also occurs. Therefore, in this article we would like to briefly describe these two concepts in more understandable words.
What is adhesion in construction?
The concept of adhesion is used when gluing surfaces that can be either homogeneous or completely different.
It is the adhesives in the composition that affect which types of materials can be glued together or on which surface a building compound can be applied, for example, plaster, repairman or others.
For example, Teknoizosıva cement plaster cannot be applied to a metal surface, since the adhesives in its composition are not intended for such an application. But on concrete, cement, aerated concrete and other mineral surfaces it can be confidently applied. The service life of the plaster will be very long.
What is cohesion in construction?
We use the concept of cohesion when we talk about the strength of a building material, since it is responsible for the bond between molecules that exists inside the material.
That is, the better the cohesion, the better the strength of the material.
For example, take the tile adhesive Teknofay Flex C2TE S1, which is used for laying natural stone and other dimensional or heavy decorative material. Nominal due to its strength or cohesive strength, the material has such a sphere of application.
Also, when you see the tensile strength in the technical characteristics of the material, you should also understand that this is the cohesive tensile strength, that is, the rupture of molecules inside the composition.
To sum up, adhesion is the bonding strength of 2 materials or two surfaces, and cohesion is the strength of the body of the material itself, that is, the tensile strength or strength of the body of the material.