Shear Resistance - What is shear resistance?
Also known as shear adhesion, shear strength, shear cohesion, or cohesive strength, this term refers to the ability of an adhesive to resist shear stress. Shear stress is a type of stress whereby the external force acting on an object or surface is acting in a direction that is parallel to the surface. For example, the shear resistance of an adhesive is tested by bonding two surfaces together using that adhesive and then forcing one of the surfaces to slide across the other (e.g. by applying a label onto a substrate and then trying to slide the label across the surface of that substrate).
While an adhesive bond is reliant on both the adhesive (external bond) and cohesive (internal bond) strength of an adhesive, shear resistance is usually associated more closely with the internal strength of an adhesive. Adhesives with low shear resistance are usually “softer”, have a higher tendency to flow, and lower cohesion, which means they are more likely to split under stress compared to adhesives with high shear resistance (which are “firmer”, have less tendency to flow, and have better cohesion).Go Back to Glossary