Abstract: A ternary molding composition is formed of an admixture of ethylene-propylene copolymer, propylene polymer, and polyethylene and contains 30-45% by weight of a partially crystalline ethylene-propylene copolymer with an ethylene content of at least 65% by weight; a melt index MFI (230/5) of 0.7-2.0 g/10 min, and a tensile strength higher than 5.0 N/mm.sup.2 ; 35-65% by weight of propylene polymer with a melt index MFI (230/5) of 15-50 g/10 min, and 3-30% by weight of polyethylene with a melt index MFI (230/5) of 15-50 g/10 min, said molding composition having a melt index MFI (230/5) of at least 8 g/10 min and a tensile strength of at least 15 N/mm.sup.2 and an elongation at yield of at least 450%.

Abstract: A ternary molding composition formed from an admixture of ethylene-propylene copolymer, polypropylene homopolymer, and polyethylene, which comprises 38-48% by weight of a partially crystalline ethylene-propylene copolymer with an ethylene content of at least 65% by weight, a melt index MFI (230/5) of 0.7-2.0 g/10 min, and a tensile strength of higher than 5.0 N/mm.sup.2 ; 27-63% by weight of a polypropylene homopolymer with a melt index MFI (230/5) of 25-65 g/10 min; and 3-30% by weight of polyethylene with a melt index MFI (230/5) of 15-20 g/10 min, the molding composition having a melt index MFI (230/5) of at least 8 g/10 min, a tensile strength of at least 15 N/mm.sup.2 and an elongation at yield of at least 450%.

Abstract: A ternary molding composition is formed of an admixture of a modified ethylene-propylene copolymer, a propylene polymer and polyethylene and contains 35-50% by weight of a modified ethylene-propylene copolymer, which is prepared by the polymerization of an ethylene-propylene copolymer onto polyethylene, with the ethylene content of the ethylene-propylene copolymer being at least 65% by weight and the modified copolymer having a melt index MFI (230/5) of 0.8-2.0 g/10 min; 30-60% by weight of polypropylene with a melt index MFI (230/5) of 25-65 g/10 min and/or propylene-ethylene copolymer with a melt index MFI (230/5) of 15-50 g/10 min, and 3-30% by weight of polyethylene, wherein the polyethylene block of the modified ethylene-propylene copolymer can be attributable to the quantity of polyethylene contained in said composition.