The growing demand for sustainable materials in marine engineering has stimulated research into polymer-based alternatives to traditional composites. To ensure their effective and safe application, a thorough understanding of their mechanical properties is essential. Within this framework, parametric modelling was employed to design tensile specimens with optimized geometry and improved reproducibility, enabling a reliable assessment of high-density polyethylene (HDPE), both virgin and recycled, for boatbuilding applications. Experimental tests show that virgin HDPE exhibits superior tensile strength and ductility, while recycled HDPE provides adequate performance for selected design applications. The combination of modelling and testing highlights the structural potential of HDPE and supports the development of more sustainable practices in small craft construction, in line with the innovation and environmental goals of the maritime sector.
