ALUMINIUM –HISTORICAL NOTES
Historical notes. Practically aluminium is a type of metal that has always been worked: Greeks and Romans used alum, a product of the working of alunite, aluminium sulphate that is widely found in nature. Alum was used in the textile industry as a fixer for colours, as well as being used for printing on parchment, for the production of glass and for the tanning of leather and finally also as a haemostatic, to tread wounds. Aluminium is a light and resistant metal, it has a specific weight equal to one third compared to steel and copper, it is ductile, malleable, it can be easily worked and offers great durability and corrosion resistance. It also does not make sparks, it is not magnetic and, thanks to its characteristics, it results as the second metal for malleability and the sixth metal for ductility. By its very nature aluminium can alloy with other metals easily. To increase its mechanical characteristics, certain quantities of alloying elements are joined to aluminium. Pure aluminium is soft and ductile, but when it combines with other elements its characteristics change radically. An easy example is enough: aluminium oxide (Al2O3), or corundum, is the hardest natural substance after diamond: in the Mohs scale it has a hardness of 9.
ALUMINIUM – THE USES AND OUR WORKING
Uses and our working. The use of aluminium exceeds, for quantity of material, that of all other metals, except for iron, and its use is important in all sectors of the world economy. Pure aluminium is weak and deformable, but it can be converted into alloy with small amounts of copper, manganese, magnesium, silicon and other elements, which have a wide range of useful properties. These alloys are used in both aeronautical and aerospace fields. Aluminium evaporated in the air gives rise to a coating that reflects both the radiant heat and the visible light. This coating creates a thin protective layer that does not deteriorate, as it can happen with silver coatings. Aluminium is used as a coating for mirrors, in the construction of telescopes.
We can define aluminium as a light and resistant metal, with a low specific weight, which offers high corrosion resistance, both electrical and thermal high conductivity, with qualities of plasticity, great ductility and malleability. It is present in our warehouse in sheets with anti-scratch PVC, with dimensions of 2500 × 1250 mm and with thicknesses of 2-3-4-5 mm.