A cohesive failure is a specific type of adhesive failure in which the adhesive fails due to internal weaknesses or insufficient strength. Unlike adhesive failure, in which the adhesive does not adhere to any of the bonded surfaces, in cohesive failure the adhesive breaks in the middle and the bond is separated without damaging any of the surfaces. Cohesive failures occur when the stresses applied to the adhesive bond exceed the internal strength of the adhesive. This can be caused by a variety of factors including the type of adhesive, surface preparation, assembly conditions, environmental conditions, and the type of forces acting on the joint. To avoid cohesive failure, it is important to select the correct adhesive for the application and perform careful surface preparation to ensure optimal adhesion. Installation conditions should also be considered to ensure the adhesive has sufficient time and space to react and develop the required strength. Extremes of temperature or humidity may also degrade the adhesive, resulting in cohesive failure. In the event of a cohesive failure, it is important to determine the cause of the failure to prevent future problems. Possible causes can be insufficient adhesive strength, overloading of the adhesive connection or errors in the application of the adhesive. A thorough examination and analysis can help determine the cause of the fracture and take the necessary measures to prevent future fractures. Overall, cohesive failure is an important concept in adhesive technology that should be taken into account when selecting and using adhesives. By considering the causes and risk factors for cohesive fractures, high-quality, long-lasting adhesive bonds can be created.