For school, we have to design a coin that uses materials with certain properties. My group thought of plastic/aluminum coins. I want to know how long this tpye of coin would last in general circulation and what will happen after it is removed. Denver Jewelry . Hardwood Flooring Denver . I need to know how much it costs to obtain these materials and to manufacture the coin. Overall cost vs expected face value of coin and lifetime for the coin.
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If you want to make coins containing both plastic and aluminium you would need to use powdered aluminium and mix it with the monomers, then initiate polymerisation. You won’t be able to melt cast the aluminium because temperature will destroy any plastic. You could melt cast a polymer around the aluminium powder though…
The materials are cheap…but it depends on the polymer you are going to use. There are thousands of polymers with different properties. You could use a biodegradable polymer (starch based, or polylactic acid) or you could use a very sturdy, non-biodegradable polymer (polystyrene, polyethylene). The method of inducing polymerisation (UV light, a catalyst or heat) will depend on the polymer you choose.
The cost would be minimal compared to the face value of the coin. Aluminium is cheaper than nearly all metals (at the moment) as it is the most abundant metal in the earth’s crust.
http://www.infomine.com/investment/metalprices/
The lifetime of the coin is something you would decide yourself by choosing a particular polymer as discussed above.
http://en.wikipedia.org/wiki/Polymers#Polymer_degradation
Best of luck!