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Aluminium is the world’s most abundant metal and is the third most common element, comprising 8% of the earth’s crust. The versatility of aluminium makes it the most widely used metal after steel. Although aluminium compounds have been used for thousands of years, aluminium metal was first produced around 170 years ago. 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.