Form This specification covers an aluminum alloy procured in the form of sheet 0.078 to 0.197 inch (2.00 to 5.00 mm)@ inclusive@ in nominal thickness@ Alclad on both sides (see 8.5). Application These products have been used typically for formed structural parts requiring good formability in T4 temper and ability to develop improved resistance to fatigue crack growth and high toughness with moderate strength when aged to T62 temper@ but usage is not limited to such applications.