TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Process: The dry fraction of the MSW is obtained from an unprocessed MSW by mechanical separation of putrescible organic fraction, separation of metal materials, shredding and possibly drying. It is obtained by subjecting a raw MSW to a process of biostabilization and subsequently a process of removing a fine fraction. The produced RDSF is subjected to a stage compaction, transported to the combustion plant and then subjected to a disaggregating stage before the stage of feeding it to the combustion plant. The compacting stage is carried out to obtain a compacted RDSF with a bulk density of 0.50-0.95 g/cm3. The stage of metering and feeding the first component and the second component onto a continuous conveyor takes place separately, each through metering screw(s) (22a-22c) and subsequently a weighing system (11a-11c). The metering screw has an advancing rate regulated in relation to the quantity of each component weighed by the corresponding weighing system. The continuous conveyor collects the various components in the form of successive overlapping layers having a bulk density which increases from the bottom towards the top.Preferred Components: A lower layer consists of the thermoplastic material. An intermediate layer consists of the dry fraction of the MSW. An upper layer consisting of the elastomeric material is formed on the continuous conveyor belt.Preferred Properties: The removed fine fraction has a dimension of less than 80 mm. At least 90 wt.% of thermoplastic material has an average particle dimension not exceeding 25 mm. At least 90 wt.% of the elastomeric material has an average particle dimension not exceeding 25 mm. At least 90 wt.% of the dry fraction of MSW has an average particle dimension not exceeding 25 mm. The dry fraction of MSW has a moisture content not exceeding 15 (preferably not greater than 10) wt.%. The obtained RDSF has a bulk density of less than 0.60 (preferably 0.35-0.12) g/cm3.    TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: The thermoplastic polymer material mainly comprises a material obtained from the shredding of chlorine-free waste plastics materials. The elastomeric polymer material mainly consists of a material obtained from the shredding of waste tires after separation of the metal and/or textile reinforcements.Preferred Composition: The obtained RDSF comprises 40-90 wt.% dry fraction of the RDSF; and 10-60 wt.% elastomeric material and/or thermoplastic material. It preferably comprises 60-80 wt.% dry fraction of the MSW; 10-30 wt.% elastomeric polymer material(s); and 10-30 wt.% thermoplastic polymer material(s).