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Reinforced plastic refers to polymer-matrix composites where a continuous polymeric phase (the matrix) is combined with a reinforcing phase that has at least one long dimension. The most common type of reinforcement is fiberglass, though carbon, boron, and aramid fibers are also used.1

These composites can be made using methods like hand lay-up for large structures such as boat hulls and tanks, or filament winding for creating strong hoop-direction strength. Another method, pultrusion, is used to produce continuous fiber-reinforced profiles. Reinforcements are added to enhance the mechanical properties of plastics, and can include particulate fillers like silica or short fibers.12

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