... high strength 3. insulation 4. long using life frp tube frp square tube is usually used as beam,armrest,fence,and handrail, and ... -ResistanceFire-retardant.Light weight and high strengthUV resistanceCustomizationSafetyInsulationEconomy Characteristic Applicationfrp tube frp square tube can be applied as beams,handrail, armrest,ladder,measuring ...