Strongwell Corporation | World Leader in Pultrusion and Pultruded Fiberglass Structures and Shapes We are the preferred Pultruded Fiberglass supplier, best value producer of Fiber Reinforced Polymer, & leading innovator of pultruded composites & structures. Strongwell is the world leader in the pultrusion of fiber reinforced polymer, FRP, to create strong, lightweight, corrosion resistant and durable structural shapes and components.