... 0.8, 1.0, 1 .2, 1.5, 2. 0, 2. 5, 3.0, 4.0, 5.0 and 6.0 mm Most sheet is produced in non-heat-treatable material (1xxx, 3xxx, 5xxx), and is supplied in a stated temper (such as ‘quarter-hard’, ‘halfhard’) ... copper or zinc, making it less suitable for making non-aeronautical alloys 2. 2 FLAT PRODUCTS 2. 2.1 Rolling mill practice Aluminium plate and sheet are manufactured in conventional rolling mills, ... applications, sheet is supplied in heat-treatable alloy (2xxx, 6xxx or 7xxx series), usually in the fully-heat-treated T6condition (quenched and artificially aged) 2. 2.4 Tolerance on thickness The thickness...