This specification covers an aluminum alloy in the form of plate 1.5 inches (38 mm) and over in nominal thickness. This plate has been used typically for parts requiring a high level of mechanical properties up to 300 °F (149 °C), but usage is not limited to such applications. Certain design and fabrication procedures may cause plate to become susceptible to stress-corrosion cracking; ARP823 recommends practices to minimize such conditions.