Does higher viscosity glue have higher strength?

Viscosity is a key parameter of adhesives. It reflects the strength of the interactions between liquid molecules during movement and is a physical measure of viscous forces.
The relative movement of adjacent fluid layers during fluid flow creates frictional resistance, which is called viscous resistance.
Simply put, in adhesives, viscosity is a reference value that reflects the thinness or thickness of the adhesive. Generally, thicker adhesives flow more slowly and have greater adhesion.
Conversely, thinner adhesives flow more quickly and, accordingly, have lower viscosity.
The bond strength of adhesives, also known as adhesive strength, is a key indicator of adhesive quality.
Adhesive strength refers to the stress required to cause a failure at the interface between the adhesive and the adherend or at the adjacent interface under the action of an external force.
Furthermore, depending on the stresses to which the adhesive is subjected during use, adhesive strength is often further subdivided into shear strength, tensile strength, peel strength, and impact strength. Bond strength depends not only on adhesion, the mechanical properties of the adhesive, the nature of the adherend, and the bonding process, but also on the joint configuration, stress conditions (type, magnitude, direction, and frequency), environmental factors (temperature, humidity, pressure, and medium), testing conditions, and experimental techniques.
It is important to note that adhesion is only one of the important factors determining bond strength. It is completely different from bond strength and cannot be equated.
The above is an introduction to adhesive viscosity and bond strength. The two are fundamentally different. Therefore, higher viscosity adhesives do not necessarily have higher bond strength. Because bond strength, in theory, does not have a fixed value, it must be considered in conjunction with the material of the adherend to be meaningful. It is important to note that actual bond strength varies significantly between adherends of different materials!