In the production of solid fuel, the contamination of the targeted plastics with other plastics Figure 3.1: Example of RPF 11 containing nitrogen, halogens (Cl, Br, F), sulfur and other hazardous substances may cause air and soil pollution by the flu gas emission and the incineration ash disposal (e.g. inorganic components such as aluminum in multilayer film of food packages produces fly ash and bottom ash).