Aluminium.

Aluminium; from the Latin alumen = alum (from its natural occurrence in alumina)

Chemical element from the third main group of the periodic table, a silver-white light metal. With a density of approx. 2.7 g/cm³, aluminium is almost two-thirds lighter than iron. […]
Source: Brockhaus.de

Finstral has been using aluminium for over thirty years now as a material for both the outside and inside of its windows. This light metal is weather-resistant, easy to maintain, durable and offers the greatest possible variety of surfaces and colours: numerous wood designs and all 230 colours of the RAL spectrum are available. And because aluminium is dimensionally stable at up to 500 degrees Celsius, even dark colours are no problem on the outside. Thanks to its new coating plant in Borgo Valsugana, Trentino, Finstral is able to respond even better to customer wishes. Here, up to twelve kilometres of profiles can be powder-coated each day – ground-breakingly energy-efficient and of the highest quality, certified to Qualicoat Seaside standards.