Polyethylene is a safe plastic. It is extremely strong compared to weight. There are many types of polyethylene and all have different tensile strengths. We use PEHD.
Polyethylene is rust and corrosion free. It stands up to weathering exposure, including salt water as well as harsh chemicals, due to a high chemical resistance, which means they are not attacked by strong bases or acids. Polyethylene is non-toxic.
Used for hull structure, polyethylene gives the boat a soft behavior while riding in harsh weather.