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Fiberglass Square Rods FRP Square Rods Fiberglass square rod 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 rod retains high strength property of glass fiber. At the same time the coating resin enables the square rod smooth surface, anti-corrosion, hard to crack or break. High strength light weight, the specific gravity of fiberglass square rods is only 2/3 of aluminum, 1/4 – 1/5 of carbon steel. Therefore, fiberglass square rods are substitute for metal square ro