It is worth pointing out that, when higher source separation levels an recycling rates have to obtained, long-lasting non-packaging plastic waste has to be included in the recyclable fractions. These materials are typically stabilized with metals, such as lead and cadmium but also zinc, antimony, PCBs, PBDEs, in order to fulfill their functions over a certain lifetime. Over time the recycling of waste containing these hazardous substances could lead to new material stocks that, in turn, could generate not only risks for its users but also problem for future waste management as a consequence of successive accumulations.