This assessment was focused on the production of non-refractory composite materials and aircraft structures made from those materials. The prepregging process represents one of the first steps in the manufacture of composite materials. During prepregging, carbon-based fiber tow bundles are impregnated with a plastic polymer powder to produce towpreg materials, which can then be formed and finished into plastic composites. The new prepregging process evaluated in this report has the potential to reduce air emissions, solid wastes, and hazardous wastes during the manufacture of prepeg materials.