Fuel Fraction (FF). By shredding and screening the MSWr in a grinder (Doppstadt DW 3060) and a 100 mm drum-screen (Doppstadt SM 518) two fractions are obtained: a fine fraction and a coarse (fuel) fraction. The fine fraction contains mainly incombustible materials and food waste, which can be used in compositing or anaerobic digestion processes. The fuel fraction (FF) is a RDF suitable for combustion. It mainly contains plastic and paper compounds and may contain up to 5 wt.% food waste due to inefficiencies in the screening process.