Aluminum Extrusion 6063 Scrap Aluminum Extrusion 6063 Scrap. It is the most common alloy used for aluminum extrusions. Normally, Aluminium Extrusion 6063 Scrap shall consist of clean aluminum profile extrusions including window, shop fittings, irrigation tubes and door frames. However, it must be free of screws, iron components, plastics, rubber or other foreign materials. Chemical composition Silicon minimum 0.2%, maximum 0.6% by weight Iron no minimum, maximum 0.35% Copper no minimum, maximum 0.10% Manganese no minimum, maximum 0.10% Magnesium minimum 0.45%, maximum 0.95% Chromium no minimum, maximum 0.10% Zinc no minimum, maximum 0.10% Titanium no minimum, maximum 0.10% Other elements no more than 0.05% each, 0.15% total Aluminium ; Remainder