Abstract: The present invention relates to sterilisation-resistant barrier films based on polyamides and polyolefins, wherein the film consists ofat least one aliphatic polyamide layer (A) andat least one polymer blend layer (B), which consists of 50-85 wt. % of polyarylamide and 15-85 wt. % of aliphatic polyamide andat least one thermoplastic heat sealing layer (C) of a polyolefin having a crystallite melting point of 121.degree. C. or above (C1) or of a polymer blend containing at least one polyolefin having a crystallite melting point of 121.degree. C. or above (C2) andat least one bonding layer (D),arranged in such a manner that a heat sealing layer and a layer of aliphatic polyamide are located on the outer sides of the film, and wherein the film is not stretched.

Abstract: The present invention relates to a highly transparent, sterilisation-resistant film, optionally containing polyamide, with elevated mechanical strength, which is thermoformable and heat-sealable, which film contains at least one layer of a polymer blend prepared from polypropylene (PP) and linear low density polyethylene (LLDPE), wherein the proportion of PP in the polymer blend is 81 to 99.8 wt. % and the proportion of LLDPE is 0.2 to 19 wt. % and the LLDPE has a density of between 915 and 950 kg/m.sup.3, preferably of 925 to 940 kg/m.sup.3.