Termination of heavy-duty polyester mooring ropes has long been an issue of concern in the marine renewable energy applications. In this study, experimental investigations were conducted on two different rope materials to investigate and compare the performance of filament, yarn, strand, sub-rope, 44mm rope and 120mm rope. The experiment setup consisted of 5kN Lloyds Machine for testing filament, yarn and strand, 500kN Denison Machine for subrope, 1500kN and 30MN tensile equipment for testing 44mm and 120mm ropes respectively.