Aluminium

It is the third most common element found on the earth’s crust. This metal has a combination of properties that make it very useful in mechanical engineering, such as its low density (2,700 kg/m3) and its high corrosion resistance. Making it into the right alloys can considerably increase its mechanical resistance. It is a good conductor of electricity and heatand is easy to machine. For all of these reasons, since the mid 20th century it has been the most used metal after steel.