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For the evaluation of the durability of a high density polyethylene polymeric geosynthetic barrier accelerated oxidation tests are carried out by using high-pressure autoclaves. The ageing tests are followed by several evaluation tests on the exposed specimens. A comparison of the evaluation test re-sults with those obtained from the same test on an unexposed control sample provides typically a basis for acceptability. The following characteristics are used: tensile properties, oxidation induction time (OIT) values, melt-flow rate (MFR), oxidation onset temperature (OOT) and strain hardening test (SHT) modu-lus. The sampling and the preparation/treatment of oxidation induction time (OIT)-specimens for meas-urements on PE-HD GBR-P made of bulk thickness or at layers in different depths are discussed. The effects of sampling from the inner core, from the surface or from the entire thickness are shown. The ef-fects of the orientation of the exposed surface in a crucible of a differential scanning calorimeter are dis-cussed. The use of a cover plate above the OIT-specimen is discussed. Lifetime prediction is shown on the basis of defined acceptance criteria for the changes of the following properties: elongation at break in uniaxial tensile tests, strain hardening modulus, MFR and OOT.