This is the bottom of the line for aluminum. Basicly if it doesnt fit into any of the other grades of aluminum metal catagorys it will probably end up here. If your aluminum has some steel , plastic, rubber ,oil, grease, iron , glass shards or bits or most any other type of material attachment it will end up here. There are even exceptions to this rule , attachments in excess could even cause your metal to be completly rejected or just to be bought as scrap iron ( shredder) material.
The most common aluminum breakage items are usually lawm mower engines (minus the steel deck and blade) TV antenna's Lawn chairs with the webbing still attached , aluminum pots and pans with handles still attached and many more items . When you are not sure if your metal falls into this group just ask your recycler for more info. Showing them the items you have is always the best way to be sure.