Increasing requirements with respect to durability and performance of polyethylene materials (PE-HD) for advanced applications in new fields also must be accounted for in the respective testing methods. One of the decisive properties, also essential in well-known relevant applications such as pipes and containers for dangerous goods, is still the resistance against slow crack growth (SCG) and environmental stress cracking (ESC) which is addressed by the full-notch creep test (FNCT). In addition to the evaluation of the time-to-failure tf under standardized testing conditions significant improvements can be achieved using an enhanced fracture surface and a crack propagation analysis with imaging techniques such as light microscopy (LM), laser scanning microscopy (LSM), X-ray computed tomography (CT-scan) and scanning electron microscopy (SEM). Besides a facilitated assessment of brittle or ductile failure modes also the identification of changes in the crack propagation mechanism due to the influence of sorptive media is enabled by these techniques.