Abstract
We keep investigating the change of organic adhesives under exterior tiles with time. The adhesive used was a Modified Silicone / Epoxy System (MSES). The 15 years outdoor exposure results were reported by the last paper, "6th Report, Change in Adhesion with the Passage of years, (5)". This time, we reported the 20 years results of MSES adhesive applied under exterior tile in tensile test. Even after 20 years, the MSES adhesive showed elasticity as well as retaining the enough strength and the cohesive failure.