Form This specification covers an aluminum alloy in the form of plate. This specification covers plate from 1.000 to 6.000 inches (25.40 to152.40 mm) in thickness (See 8.4). Application This product may be used in aerospace applications requiring high strength and good fracture toughness@ good resistance to stress-corrosion cracking and to exfoliation corrosion@ but usage is not limited to such applications.