The invention relates to granulates containing high and/or ultra-high molecular weight polyethylenes and fillers and/or reinforcing agents. Any homo- and copolymers can be used as the high or ultra-high molecular weight polyethylenes, provided that said homo- and copolymers have a high or ultra-high molecular weight and are derived from ethylene as the monomer, which is used optionally in combination with additional ethylenically unsaturated hydrocarbons or combinations thereof. Preferred fillers are carbon black, graphite, metal powder, such as aluminium powder and mineral powder, such as wollastonite. Preferred reinforcing agents are glass, carbon or metal fibres. The filler and/or reinforcing-agent content in the inventive granulate is usually up to 60 wt. %, in relation to the granulate. A range of between 0.1 and 40 wt. % is preferred. The invention also relates to a method for producing granulates containing HMW and/or UHMW polyethylenes and fillers and/or reinforcing agents with the aid of an extruder, preferably a single-screw extruder, whose screw shaft is divided into a feed zone, a conversion zone and a delivery zone and is configured, at least in the conversion zone, as a barrier screw.