What is an adherend in an adhesive joint?

In the context of adhesive chemistry, an adherend is defined as the component or body being joined by an adhesive. Essentially, it is the surface to which an adhesive adheres.12

Adherends can consist of various materials, such as metal alloys, plastics, or composite materials. The performance and durability of an adhesive joint depend significantly on the properties of these adherends, the nature of any surface pretreatments, and the adhesive itself. During the bonding process, the adhesive must be able to wet and spread across the adherend surfaces to achieve the intimate molecular contact necessary for a strong, stable joint. Once bonded, the joint's mechanical behavior is influenced by how applied loads are transferred from one adherend to the other through the interphase—a transitional zone formed at the interface between the adhesive and the adherend.1