The critical mechanism in the post-glass-breakage response of laminated glass is delamination of polymeric interlayer from glass shards. To investigate adhesion properties between glass and PVB, “Through-Cracked-Tensile” tests have been performed at room temperature, with different stain rate and polymer thickness. Using photoelastic properties of PVB, the stress has been detected during the test while measuring force-displacement and force-delamination diagrams. Two different failure modes have been recognized, influenced by the presence of friction while relative sliding between the two materials occurs. A steady delamination takes place only when friction is not present; on the other hand, friction can arrest delamination, and the interlayer eventually breaks. Results have been interpreted though a minimal model that predicts the delamination load.