The Post Box

Metal in its pure form takes comprises of Gold, Copper, Lead, Tin, Mercury or smelted iron.  With the exception of copper and perhaps tin, and for a variety of reasons, it would not be a good idea to construct a post box out of any of the remaining metals.  In the case of mercury and lead, pure metals are too soft or brittle to use for a post box, their chemical makeup can also react adversely to the elements, such as copper and tin.  They can also be very expensive in their pure form, as is the case of Gold or Silver.

Therefore, an alloy would be the wiser choice.  An alloy contains two or more elements.  The majority of its component is metal.  When different ratios of metals are combined the properties of pure metal is altered and the result is a less brittle, stronger, corrosion resistant product.

A well known example of an alloy is steel, brass and bronze.  However, both brass and bronze are not good materials for use in post boxes that spend their life outside in the elements.  Therefore, steel possible the best choice.

Cast aluminium is a specific metal that has been processed in order to temper the aluminium.  An example of a process could be die casting or sand casting.  This results in a metal which can be used for the manufacture of external, hardwearing post boxes which allow for minimal maintenance and care.

Another product of metal is cast iron.  Cast iron also undergoes processing and is a popular choice for outdoor applications.

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