Abstract: A composite board having a top surface, a core, and a bottom surface includes a polymeric material and a plurality of particles contacting the polymeric material to form a mixture. The weight percentage of the particles is greater than the weight percentage of the matrix material in the composite board. The volume of the plurality of particles range from 25% by volume to 88% by volume of the composite board. The composite board has a density in the range from 0.38 g/cm3 to 2.2 g/cm3. The top surface, the core, and the bottom surface are substantially comprised of the mixture.

Abstract: A process for manufacturing an elongated panel formed of synthetic materials including a polymer resin matrix, a filler and a fiber reinforcement. The process includes depositing the curable composition on a conveyor belt, distributing and leveling the curable composition prior to feeding the composition into a compression apparatus in which the curable composition is partially cured as it is compressed to form the panel. The machine for manufacturing the composite panel includes a mixer for the polymer system, filler and fiber reinforcement, a distribution apparatus that distributes the curable composition prior to feeding the composition into a compacting apparatus. The process and machine may be used to form a composite siding board that includes a grain pattern on at least one side.