Thermoplastics as a matrix material in fiber reinforced polymers have become increasingly important for aerospace structures in recent years. These fiber reinforced thermoplastics offer great potential regarding weldability, thermofomability and recyclability. Compared to thermoset composites their storage life is not restricted and they are known for their excellent toughness and chemical resistibility. Typical shell constructions, in which many stiffeners and panels are joined to complex structures, are built in a much more integral and weight efficient way with the help of fusion bonding techniques. Rivets and holes become obsolete, as a substance-to-substance bond is created which can be separated in the case of damage during manufacturing or service. In our previous publication the resistance heating method has been chosen as preferred technique of disassembling such structures. However, this study focus on the development and manufacture of a separation layer which is placed at the bond line of the components, so only the bonding zone of the assembled parts will be heated. As the separation layer remains in the component after the joining process, the influence of the heating element on the mechanical behavior of the fiber reinforced thermoplastic polymer is determined using single lap shear tests and fracture mechanics test under Mode I loading conditions. Finally, disassembly tests are performed in order to ensure specimen separation without damage of the joint partners.