AA 6063 is an aluminium alloy, with magnesium and silicon as the alloying elements. The standard controlling its
composition is maintained by The Aluminum Association. It has generally good mechanical properties and is heat 
treatable and weldable. It is similar to the British aluminium alloy HE9.

6063 is the most common alloy used for aluminium extrusion. It allows complex shapes to be formed with very smooth 
surfaces fit for anodizing and so is popular for visible architectural applications such as window frames, door frames, roofs, 
and sign frames. Applications requiring higher strength typically use 6061 or 6082 instead.