**2. Previous results**

Pyrolysis is the thermal decomposition of a material at a relatively elevated temperature under an inert atmosphere. It involves a change of the chemical composition of the waste polymer that will be converted into a solid, a liquid, and a gaseous product. These products will be directly used as solid, liquid, or gaseous fuels to produce energy or employed as raw materials for the synthesis of new products [3].

Pyrolysis of end-cycle plastic materials using the microwave as heating technology (Microwave-Assisted Pyrolysis: MAP) has been reviewed ten years ago [4–6]. The polymeric materials have a low efficiency to convert microwave radiation into heat (see **Table 1**), but if a microwave absorber is added, sometimes erroneously called a catalyst, the pyrolysis may run very efficiently. The absorbers are compounds showing a high efficiency to convert microwave into heat and the main types employed are silicon carbide, carbon, iron, and so on. Anyway, in the literature, it is possible to find a list of many different compounds able to convert MW into heat, each one with specific features.

In the previous review [4] was reported some preliminary results on the pyrolysis of several waste plastics such as High-Density Polyethylene (HDPE), Polypropylene (PP), Polystyrene (PS), Polyvinylchloride (PVC), Polyethylentherephtalate (PET), and end cycle tyre but these data were referred to 10 years ago.
