This specification covers an aluminum alloy in the form of sheet and plate supplied in the annealed (O) condition. When specified, product shall be supplied in the "as fabricated (F) temper.These products have been used typically for parts requiring high strength up to 500 mDF (260 mDC) after heat treatment, but usage is not limited to such applications. May be welded and formed in the specified condition but properties are improved by heat treatment.