Since its industrial discovery in the 19th century (the Hall-Héroult process), aluminium has redefined the concept of structural lightness. In architecture, its large-scale use took off with modern skyscrapers and the invention of the curtain wall.
Pure aluminium is too soft for structural uses. In construction the alloys of the 6000 series (aluminium-magnesium-silicon) are mainly used. These alloying elements ensure a perfect balance between mechanical strength and suitability for extrusion. Through a steel die, the pre-heated aluminium billet is pressed to create profiles with complex sections, integrating into a single piece the clips, gasket grooves and chambers for the thermal break.
On contact with oxygen, aluminium naturally forms an infinitesimal passivating film. For outdoor use, this protection is artificially multiplied through anodising (a controlled electrochemical process that generates a hard, porous oxide layer, then sealed) or through thermosetting polyester powder coating, which offers an unlimited colour range (QUALICOAT standard).
Standards
European and international references applicable.
Physical properties
Usage environment
Given the very high thermal conductivity, in window frames aluminium must be coupled with polyamide insulating strips (Thermal Break) to avoid condensation and heat losses.