**2. Difficulties in plastics recycling**

As mentioned previously, many obstacles can be found during the end-of-life plastic recycling. In this unit there are presented in detail three case studies, including: polymeric blends (difficulties due to the coexistence of mixed plastic wastes), plastics originating in multilayer packaging (challenging because of the coexistence of different materials, such as plastics, paper, and metals), and brominated flameretarded plastics from WEEE (possible formation of undesirable, toxic substances due to the BFR's presence), along with suggestions on how to overcome these difficulties.
