Form: This specification covers an aluminum alloy in the form of sheet laminated with one or more layers of unidirectional aramid fiber/epoxy prepreg. Application: This product has been used typically for structural parts requiring a combination of high fatiquecrack- growth resistance@ fracture toughness@ and resistance to corrosion@ but usage is not limited to such applications. Classification: Laminated sheet supplied shall be of one of the types shown in Table 1@ as specified by purchaser; aluminum alloy sheet is represented in the lay-up sequence by the letter A and prepreg by the letter P.