Sheeting Molding Compounds Sheeting Molding Compounds(SMC) consisting of thermoset matrix resin( usually polyster and vinyl ester and epoxy), low profile additives, curing agents, mould release agents, pigment, secondary fillers such as calcium carbonate, diffusion agent and refinforcements (glass, carbon, natural fibers and etc) is a excellent composite material. It was widely used in aviation, chemistry and mechanical (especially the automobile) industries and etc due to its good properties such as tight tolerances, heat and wear resistance, low density, low profile, good insulating and weight saving.