This specification covers boron filaments and 6061-0 aluminum alloy foil laminated and bonded into a composite sheet. These products have been used typically for fabrication of structural components by forming, laminating, and diffusion bonding into structural components where the composite properties of high-modulus boron filaments and aluminum alloy matrix are desirable for use up to 500 °F (260 °C), but usage is not limited to such applications.