This work presents a study of the physical and mechanical properties and erosion wear of traditional and hybrid polyester matrix composites. Traditional and hybrid composites were prepared by Hand lay-up molding and investigated. The composites constituents were unsaturated polyester resin as the matrix, 3% and 6% volume fractions of carbon fibers as reinforcement and 3% of Al2O3, Al, Cement and local Gypsum as filler particles. The investigated physical properties were density, porosity, water absorption and thermal conductivity, while the mechanical properties were hardness, tensile...