Using plastics as a replacement for metal is now quite commonplace. Some applications on first appearance seem far too demanding to make the switch. However, a combination of good design and appropriate material selection can meet the most exacting of demands.
One such application is the insulator that supports the third rail supplying power to electric trains. Parts of the rail network and the London Underground system use third rails to supply power to trains.
Allied Insulators Group supplies a wide range of insulators to the electricity, rail and telecommunications industries. The company has been supplying third rail insulators for more than 40 years with the original product being a solid porcelain insulator with a metal cap and flange base that is cemented to the porcelain body.