Making aluminium foil is a hot business. The annealing of the concast aluminium block is critical to making the material soft enough to be rolled into foil. The process runs at 500 degrees Celsius for 13 hours, during which both the slab and the transportation truck, including its bearings, are subjected to this temperature. The original plain bearings of cast iron lasted three to four weeks, whereas SKF 6210 2Z/VA208 deep groove ball bearings incorporating a special graphite segment case last more than six months.