EN 2597:1998 is a testing standard that specifies the method of determination of the ultimate tensile strength, tensile modulus, Poisson’s ratio, and strain at failure in tension of carbon fiber reinforced plastics in the form of unidirectional laminates. EN 2598 is used for product development and quality control by a range of manufacturers who use carbon fiber laminates, including the aerospace, automotive, wind energy, and construction industries. This method is only applicable to specimens where the axis is perpendicular to the direction of the fibers. Testing when the axis is parallel to the fiber direction calls for the use of EN 2561.