Interfacial adhesive strength between the fully-crosslinked and partially-crosslinked rubber layers were investigated at the temperature range of 30∼120℃ for four different rubbers(NR, SBR, EPDM, BIMS). The surfaces of interfacial failure were also investigated using a scanning electron microscopy(SEM). The physical interlinking played a major role in the adhesive strength between the fully-crosslinked rubber layers. When a partially-crosslinked rubber layer was bonded to the fully-crosslinked one, the chemical as well as the physical interlinking affected the adhesive strength. NR showed a $quot;interfacial knotty tearing$quot; pattern, while EPDM showed a typical $quot;cross-hatched$quot; one when the adhesive strength approached to the cohesive tear strength of each material.