US Patent 7384354 Single wall ball bat including quartz structural fiber

A single-wall ball bat is made up of a series of layers or plies of unidirectional, two-dimensional, structural fibers having high strain energy properties. The plies are optionally layered upon each other in a lamina structure in which the fibers in one ply are oriented at opposing angles to the fibers in one or more neighboring plies. High purity quartz (SiO2) fibers, which have very high strain energy properties, may be used to construct substantial portions of the barrel or other regions of the ball bat.