Nowadays, due to the requirement to achieve specific product properties or to reduce the weight of machine parts, conventional metal materials are replaced by plastics. Various methods are used to connect them to assemblies. The task of the joint is to provide a perfect, but particularly reliable, compact unit. One of the relatively effective methods of bonding plastic parts is their bonding. In addition to the properties of the adhesive used, the quality and reliability of the bonded plastic components also depend on the properties of the plastic materials used. The aim of the experimental research was therefore to contribute to the knowledge in the field of strength properties of bonded joints using PA6 and PBT plastic materials with different amount (wt%) of recycled polymer.