What is the difference between grey iron, aluminum, ductile iron and bi-metals?
Aluminum Cast aluminum is the most flexible and forgiving of all legitimate lamppost materials. It is soft, light weight, melts at relatively low temperatures (approx. 1200 deg) and can be cast in fairly thin sections. Aluminum is also easy to finish, machine and can be cast in small sections and welded together structurally to create pedestrian scale lampposts. As a result, aluminum is a very cost effective alternative to authentic one-piece ornate light standards. Due to its lightweight, installation can be achieved on smaller budgets with little to no heavy machine requirements. Disadvantages: Although aluminum is very workable it is also a very soft metal. Cast poles and bases are susceptible to dings and nicks even through routine pedestrian activity. Also as aluminum ages, it hardens, becomes more brittle, and is predisposed to fatigue failure. Grey iron Grey or “gray” iron is the original cast iron and has been cast in various forms for thousands of years. It has withstood the t
