Singlelayer and multilayer polyolefin foam pipes

Polyolefin foam pipe of a single layer or multilayer with improved compression strength where at least one of the layers is comprised of a polyolefin foam layer, characterized in that the polyolefin foam layer, having a density of 50-850 kg / m3, comprises mixtures of a) 5 to 80% by weight of a compound a selected from modified propylene polymers with a melt index of 0 05 to 10 g / 10 min at 230 ° C / 2 , 16 kg, preferably 0, 2 to 10 g / 10 min at 230 ° C / 2, 16 kg, which modified propylene polymers have a hardening behavior cold deformation, and mixtures of such modified propylene polymers, B) 20 to 95% by weight of a compound B selected from propylene homopolymers with a stereospecivity index> 98% and a melt index of 0 05 to 10 g / 10 min at 230 ° C / 2, 16 kg, preferably 0, 1 to 10 g / 10 min at 230 ° C / 2, 16 kg and copolymers of 80 to 99, 9% by weight of propylene y0, 1 to 20% by weight of ethylene or alpha - olefins with 4 to 18 carbon atoms carbon with a stereospecivity index of the homopolymer matrix propylene> 96% and a melt index of 0, 1 to 10 g / 10 min at 230 ° C / 2, 16 kg, and mixtures of such homopolymers and / or copolymers propylene, and C) optionally, usual amounts of stabilizers and / or processing aids and / or antistats and / or pigments and / or nucleating agents and / or fillers as auxiliary substances.