Glue on Panels
With this method flat sheets of 6mm FRP are produced and cut to size. The internal structure is then fabricated and the cut FRP panels are glued to the internal structure. Now you have a product that technically will meet the FRP specification, But.
With the vacuum infusion method the liquid plastic resin completely encapsulates the internal structure in a mold. The reinforcement and core material are laid-up dry in the mold. This is done by hand and provides the opportunity to precisely position the reinforcement. The resin is introduced into the mold after a vacuum has pulled the bag down which compacts the glass laminate. The vacuum creates lower than atmospheric pressure in the mold cavity causing the liquid resin to permeate the mold. Very high resin-to-glass ratios are possible with vacuum infusion and the mechanical properties of the laminate are superior. Vacuum infusion can produce laminates with a uniform degree of consolidation, producing high strength, lightweight structures.