This specification covers the specific requirements for 7178 aluminum alloy alclad plate and sheet; the general requirements are covered in AMS-QQ-A-250. The plate and sheet covered by this specification shall be an integral composite product consisting of a heat-treatable aluminum alloy (7178) core with thin layers of an aluminum alloy (7072) anodic to the core and of approximately equal thickness bonded to both surfaces.
This specification covers an aluminum alloy in the form of rolled or cold finished bars and rods 0.500 in. (12.70 mm) and over in nominal diameter or least distance between parallel sides.