The 'Rubberized' kegs that you see in the SAB Miller fleet are not plastic, they are a standard stainless steel shell, they have just been coated in rubber. There are also some floating around out there that just have rubberized chimes, top and bottom, but the center is exposed stainless.
There are two major plastic kegs coming to use in the industry - the standard reusable ones mentioned above and the new disposable (recyclable) one way 'key kegs' which are intended for one-way shipping, mostly for imports, where it isn't efficient or cost effective to send empty shells that take up just as much room back overseas on a boat.
