Multilayer composite comprising the following layers: I. a first layer (layer I) of a moulding compound comprising at least 40 wt% of the following components: 1) 60 to 99 parts by wt. of a partially aromatic copolyamide which consists of monomer units which are derived from α) 41 to 90 mol% of a combination of hexamethylenediamine and terephthalic acid and β) 59 to 10 mol% of a combination of hexamethylenediamine and a linear aliphatic dicarboxylic acid having 8 to 19 carbon atoms; wherein the mol% values relate to the sum of α) and β) and wherein not more than 20% of the hexamethylenediamine may be replaced by the equivalent amount of another diamine and/or wherein not more than 20% of the terephthalic acid may be replaced by the equivalent amount of another aromatic dicarboxylic acid and/or 1,4-cyclohexanedicarboxylic acid and/or wherein not more than 20% of the repeating units composed of hexamethylenediamine and linear aliphatic dicarboxylic acid may be replaced by the equivalent quantity of units derived from a lactam/an ω-aminocarboxylic acid having 6 to 12 carbon atoms, 2) 40 to 1 parts by wt of an olefinic copolymer as impact modifier, wherein the parts by wt. of 1) and 2) sum to 100; II. a second layer (layer II) of a moulding compound comprising at least 60 wt% of EVOH, III. a third layer of a polyamide moulding compound. I. a first layer (layer I) of a moulding compound comprising at least 40 wt% of the following components: 1) 60 to 99 parts by wt. of a partially aromatic copolyamide which consists of monomer units which are derived from α) 41 to 90 mol% of a combination of hexamethylenediamine and terephthalic acid and β) 59 to 10 mol% of a combination of hexamethylenediamine and a linear aliphatic dicarboxylic acid having 8 to 19 carbon atoms; wherein the mol% values relate to the sum of α) and β) and wherein not more than 20% of the hexamethylenediamine may be replaced by the equivalent amount of another diamine and/or wherein not more than 20% of the terephthalic acid may be replaced by the equivalent amount of another aromatic dicarboxylic acid and/or 1,4-cyclohexanedicarboxylic acid and/or wherein not more than 20% of the repeating units composed of hexamethylenediamine and linear aliphatic dicarboxylic acid may be replaced by the equivalent quantity of units derived from a lactam/an ω-aminocarboxylic acid having 6 to 12 carbon atoms, 2) 40 to 1 parts by wt of an olefinic copolymer as impact modifier, wherein the parts by wt. of 1) and 2) sum to 100; 1) 60 to 99 parts by wt. of a partially aromatic copolyamide which consists of monomer units which are derived from α) 41 to 90 mol% of a combination of hexamethylenediamine and terephthalic acid and β) 59 to 10 mol% of a combination of hexamethylenediamine and a linear aliphatic dicarboxylic acid having 8 to 19 carbon atoms; wherein the mol% values relate to the sum of α) and β) and wherein not more than 20% of the hexamethylenediamine may be replaced by the equivalent amount of another diamine and/or wherein not more than 20% of the terephthalic acid may be replaced by the equivalent amount of another aromatic dicarboxylic acid and/or 1,4-cyclohexanedicarboxylic acid and/or wherein not more than 20% of the repeating units composed of hexamethylenediamine and linear aliphatic dicarboxylic acid may be replaced by the equivalent quantity of units derived from a lactam/an ω-aminocarboxylic acid having 6 to 12 carbon atoms, α) 41 to 90 mol% of a combination of hexamethylenediamine and terephthalic acid and β) 59 to 10 mol% of a combination of hexamethylenediamine and a linear aliphatic dicarboxylic acid having 8 to 19 carbon atoms; 2) 40 to 1 parts by wt of an olefinic copolymer as impact modifier, wherein the parts by wt. of 1) and 2) sum to 100; II. a second layer (layer II) of a moulding compound comprising at least 60 wt% of EVOH, III. a third layer of a polyamide moulding compound.