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Fiberglass Square Tube FRP Square Tube Fiberglass square tube is reinforced composite material consisting of continuous glass fiber yarn and resin, which are pulled by the thermal pultrusion moulding machine. The pultruded fiberglass square tube retains high strength property of glass fiber. At the same time the coating resin enables the tube smooth surface, anti-corrosion, hard to crack or break. High strength light weight, the specific gravity of fiberglass tube is only 2/3 of aluminum, 1/4 – 1/5 of carbon steel. Therefore, fiberglass tubes are substitute for metal Square tubes.Our line of f