Manufacturers of molded Fiber Reinforced Polymer (FRP) composite parts are increasingly using Reusable Vacuum Bags (RVBs) in their processes. These membranes, made from silicone, increase productivity, reduce costs and improve the quality and consistency of parts, while reducing the use of consumables. FRP composites are used in a wide variety of industries: automotive, renewable energy, aerospace, marine, construction, etc. These materials are composed of various fibers, such as glass, carbon and aramid mixed into resins, including epoxies, unsaturated polyesters, vinyl esters, phenolics, polyurethane and hybrids. Traditionally, FRP composite and hybrid material molding has used disposable plastic bag sheets that are placed and manually assembled by highly-skilled operators, an expensive and time-consuming process that generates a great deal of waste. Silicone RVBs can be used several times and can be easily adapted to different industrial needs, ensuring accurate, consistent, more environmentally friendly and cost-effective FRP molding.