The application field of thermoplastic/liquid silicone rubber (LSR) combinations is remarkably wide, ranging from household consumers to the automotive sector. For the application of these combinations, the adhesion is the deciding factor. The adhesion is not only influenced by the applied polymers, but also by a tempering step. In the case of LSR, the industry already uses tempering for improving its mechanical properties. To date, there is no profound knowledge in annealing the combinations thus making the influence on adhesion unclear. Therefore, the influence of different tempering temperatures (80 degrees C, 100 degrees C, and 120 degrees C) and times (1, 3, 6, and 9 h) on adhesion between the thermoplastic (PBT and PA 12) and LSR was examined. The results clearly showed that post-tempering influences the single components. In the case of PBT, postcrystallization already occurs at 80 degrees C, which is reflected for instance by increasing the degree of crystallinity by about 22%. LSR showed post-cross-linking and the release of volatile components. Analyzing the tempering impact on adhesion the peel resistance of LSR and PBT decreased around 23% at 80 degrees C. The covalent bonds at the boundary layer are weakened due to the postcrystallization and the release of volatile components. POLYM. ENG. SCI., 56: 849-855, 2016. (C) 2016 Society of Plastics Engineers