More and more boat owners are having to replace the glazing on their boats with aluminium windows. Aluminium has a number of advantages over more costly materials such as stainless steel or brass. Most importantly, it allows greater flexibility in design and requires less maintenance.
For these reasons it is the most popular metal for manufacturing marine window frames.
Although bare untreated aluminium has a relatively good corrosion resistance, it is not recommended for a marine environment. To improve their corrosion resistance, aluminium windows are either anodised or powder-coated.