Why are hard-coat anodized aluminum kettles considered the best?
When you are cooking popcorn, there are two key elements – heat transfer and ease of cleaning. Aluminum provides the best heat transfer of any approved cooking material (i.e. the heat from the elements transfer completely to the food resulting in much better performance). When you anodize aluminum, you are changing the molecular surface of the aluminum and filling in the pores of the material. This makes a smooth and slippery surface that is easy to clean and is extremely durable.
