Resin transfer molding is a process that is done under low pressure and in a closed mold and is used to produce various composite parts with different dimensions. Here, by using various reinforcing fibers and a thermoset resin, composite parts are prepared with high dimensional accuracy and excellent surface quality. Various resins including epoxy, phenolic, unsaturated polyester and vinyl esters can be used in this process. Reinforcing fibers such as glass fibers, carbon fibers and Kevlar fibers Also, synthetic fibers can be used separately or in combination with each other. The type of fiber and resin determines the price and mechanical efficiency, molding conditions and the quality of the piece’s surface. In addition to the above-mentioned materials, according to the case, additives are added to improve the anti-fire and bending properties as well as the quality of the surface.