What must an adhesive be capable of doing to effectively bond materials?

An effective adhesive must cure to a solid and wet the joint faces completely. This ability ensures that the adhesive can create a strong bond between the materials being joined. Curing allows the adhesive to transition from a viscous state to a solid state, which is crucial for developing tensile and shear strength in the bond.

Wetting the joint faces is equally important because it allows the adhesive to penetrate and fill gaps at the interface of the materials. This interaction not only forms a mechanical interlock but also facilitates chemical bonding with both surfaces, enhancing the overall durability and integrity of the joint.

While quick evaporation of an adhesive might seem beneficial in certain contexts, it can lead to inadequate bonding if the adhesive does not have enough time to properly engage with the materials. Rapid cooling may affect the flexibility and effectiveness of the adhesive, while remaining liquid for rework could compromise the strength of the bond once it sets. Thus, the requirement for proper curing and wetting is essential for achieving a reliable and lasting adhesive bond.