Polypropylene-Polyethylene blends comprising component A) 75 to 90wt% of a blend of A-1) 30 to 70wt% of polypropylene and A-2) 70 to 30wt% of polyethylene; whereby component (A) is not a heterophasic polymer, and B) 10 to 25wt% of a compatibilizer being a heterophasic polyolefin composition comprising B-1) 55 to 90wt% of a polypropylene with an MFR 2 between 1.0 and 300 g/10 min (according to ISO 1133 at 230°C at a load of 2.16 kg) and B-2) 45 to 10wt% of a copolymer of ethylene and propylene or C 4 to C 10 alpha olefin with a glass transition temperature Tg (measured with dynamic-mechanical thermal analysis, DMTA, according to ISO 6721-7) of below -45°C and an intrinsic viscosity (measured in decalin according to DIN ISO 1628/1 at 135°C) of at least 3.3 dl/g, whereby the blend has (i) a Charpy Notched Impact Strength (according to ISO 179-1eA, measured at 23°C) of at least 2% higher than for the same blend without the compatibilizer B) and at the same time (ii) a Flexural Modulus (according to ISO 178) of at least 3% higher than for the same blend without the compatibilizer B) and additionally (iii) a heat deflection resistance (determined with DMTA according to ISO 6721-7) expressed by the temperature at which the storage modulus G' of 40 MPa is reached (T(G' = 40 MPa)) which is at least 4°C higher than for the same blend without the compatibilizer B). component A) 75 to 90wt% of a blend of A-1) 30 to 70wt% of polypropylene and A-2) 70 to 30wt% of polyethylene; A-1) 30 to 70wt% of polypropylene and A-2) 70 to 30wt% of polyethylene; whereby component (A) is not a heterophasic polymer, and B) 10 to 25wt% of a compatibilizer being a heterophasic polyolefin composition comprising B-1) 55 to 90wt% of a polypropylene with an MFR 2 between 1.0 and 300 g/10 min (according to ISO 1133 at 230°C at a load of 2.16 kg) and B-2) 45 to 10wt% of a copolymer of ethylene and propylene or C 4 to C 10 alpha olefin with a glass transition temperature Tg (measured with dynamic-mechanical thermal analysis, DMTA, according to ISO 6721-7) of below -45°C and an intrinsic viscosity (measured in decalin according to DIN ISO 1628/1 at 135°C) of at least 3.3 dl/g, B-1) 55 to 90wt% of a polypropylene with an MFR 2 between 1.0 and 300 g/10 min (according to ISO 1133 at 230°C at a load of 2.16 kg) and B-2) 45 to 10wt% of a copolymer of ethylene and propylene or C 4 to C 10 alpha olefin with a glass transition temperature Tg (measured with dynamic-mechanical thermal analysis, DMTA, according to ISO 6721-7) of below -45°C and an intrinsic viscosity (measured in decalin according to DIN ISO 1628/1 at 135°C) of at least 3.3 dl/g, whereby the blend has (i) a Charpy Notched Impact Strength (according to ISO 179-1eA, measured at 23°C) of at least 2% higher than for the same blend without the compatibilizer B) and at the same time (ii) a Flexural Modulus (according to ISO 178) of at least 3% higher than for the same blend without the compatibilizer B) and additionally (iii) a heat deflection resistance (determined with DMTA according to ISO 6721-7) expressed by the temperature at which the storage modulus G' of 40 MPa is reached (T(G' = 40 MPa)) which is at least 4°C higher than for the same blend without the compatibilizer B). (i) a Charpy Notched Impact Strength (according to ISO 179-1eA, measured at 23°C) of at least 2% higher than for the same blend without the compatibilizer B) and at the same time (ii) a Flexural Modulus (according to ISO 178) of at least 3% higher than for the same blend without the compatibilizer B) and additionally (iii) a heat deflection resistance (determined with DMTA according to ISO 6721-7) expressed by the temperature at which the storage modulus G' of 40 MPa is reached (T(G' = 40 MPa)) which is at least 4°C higher than for the same blend without the compatibilizer B). <EOS>