This specification covers an aluminum alloy in the form of sheet and plate. This product form has been used typically for structural parts requiring high strength up to 500 °F (260 °C) after proper precipitation heat treatment and which may require forming or welding during fabrication, but usage is not limited to such applications. Certain design and processing procedures may cause these products to become susceptible to stress-corrosion cracking; ARP823 recommends practices to minimize such conditions.