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Aluminium sheet is defined as cold rolled material over 0.2mm thick but not exceeding 6mm thick. The wide range of alloys available can be broadly split into two groups, the work hardening alloys and the heat treatable alloys. Sheet, the most widely used form of aluminium, is found in all of the aluminium industry’s markets. In packaging, sheet is used to manufacture panels for automobile bodies and tractor trailers. Sheet is used in appliances and cookware. Rolling the aluminium begins by preheating the sheet ingots. Once the ingot is properly heated to rolling temperatures, the aluminium is then fed into the breakdown mill. After the rolling process, the aluminium sheet is wound up into a coil. The coils are cooled by passing them through several cold rolling mills.