Aluminium is a chemical element with symbol Al and atomic number 13. It is silvery-white, soft, nonmagnetic and ductile metal in the boron group. By mass, aluminium makes up about 8% of the Earth¿s crust, it is the third most abundant element after oxygen and silicon and most abundant metal in the crust. It is remarkable for its low density and its ability to resist corrosion through the phenomenon of passivation. Aluminium and its alloys are vital to the aerospace industry &important in transportation and building industries such as building facades & window frames