With an annual use of almost 47 million metric tons aluminium is the second most commonly applied metal in the world. The main reasons for the continued growth of aluminium use are its ratio of strength to density, the conductivity, its barrier properties, the excellent corrosion resistance and the recyclability. Aluminium?Its lightweight performance delivers great benefit in transportation applications such as aerospace, cars, ships, trains and buses and helps to increase fuel economy, reduce emissions and improve driving performance. Another significant advantage of aluminium is its corrosion resistance which is valuable for products used in architecture, construction, civil engineering, transport, for heat exchangers and many other applications.