The process of LRTM uses a rigid base or A-side mold and a semi-rigid B-side mold that incorporates seals along the peripheral flange to facilitate vacuum pressure and resin infusion. Reinforcement materials such as knits, mats or infusion products are layered into the mold. Core materials such as foam or balsa may also be added to increase part stiffness. Once all materials are placed, the two matching A and B-side molds are closed and clamped, and a vacuum is applied.  When vacuum pressure is achieved, catalyzed resin is injected into the mold via an injection port. Vacuum pressure is maintained until the cavity is filled and cured with subsequent vacuum release and demolding of the part.