Initial and final adhesion strength, influence of adhesive thickness


Soft-set adhesives generally have a higher initial tack than hard set adhesives.

In case of bonds that require a high ultimate adhesion, hard set adhesives are preferred.

The ultimate adhesion strength is achieved with hard-set adhesives after a dwell time of about 72 hours.

Important: The adhesion cannot be determined by a thumb test. Tapes with very high ultimate adhesion and shear strength often suggest the impression of weak adhesion from this subjective test.