2000 series aluminum alloys typically contain between 2 to 10% of copper, with smaller additions of other elements, including Al-Cu-Mg, Al-Cu-Mg-Fe-Ni, Al-Cu-Mn, etc. They are heat-treatable alloys and can be precipitation hardened to strengths comparable to steel. They are formerly referred to as duralumin and were once the most commonly aerospace alloys. This series alloy features good heat-resistance quality and machinability. The introduction of copper reduces its ductility and corrosion resistance, which makes it to be coated with a layer of pure aluminum.
To pack the aluminum sheet/plate/coil, first of all, put a layer of plastic film with a thickness of no less than 0.08mm in the packing box, then a layer of EPE foam, the third layer of PE kraft paper, and finally put the desiccant.