Resin Transfer Molding (RTM) is a closed mold process which is used to make complex shapes. In this process, liquid resin is injected into a closed mold cavity which contains pre-placed reinforcement. The resin flows through the reinforcement, such as fiberglass mats, preforms or fabrics, impregnating and wetting it out. The composite material is cured under a low pressure and RT or moderate heat to form the final part.