This specification covers one type of carbon fiber in the form of tow. The product covered by this specification is multi-filament strands of fine carbon filaments having a nominal filament diameter of 7 microns (7 um) and containing either 3,000, 6,000, or 12,000 filaments per tow as specified by purchaser. Carbon tow with 450 ksi (3103 MPa) tensile strength and 32 Msi (221 GPa) tensile modulus for use in general purpose structural composites requiring high tensile strength and high modulus of elasticity in tension.