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Al - Chemical symbol for Aluminium.

Element with atomic weight 26.98, atomic number 13, mp 660.37 ºC, specific gravity 2.69. It is the most abundant of the metallic elements but is very difficult to extract and was not properly known until 1827. 

Aluminium is an easy metal to polish. It is soft enough that even the roughest aluminium parts can be quickly polished to a bright shine.

Polished aluminium has a fault, it tarnishes quickly. Most factory polished aluminium parts are sprayed with a clear lacquer, acrylic or urethane to seal the part.

Like stainless steel, aluminium is relatively resistant to corrosion, but it is very susceptible to attack by strong acids and alkalis used in some cleaning products.