... . insulation 4. long using life frp square pipe hollow frp pipe is usually used as beam,armrest,fence,and ... weight and high strengthUV resistanceCustomizationSafetyInsulationEconomy Characteristic Applicationfrp square pipe hollow frp pipe can be applied as beams,handrail, armrest, ... ladder,measuring instrument etc. Pultruded fiberglass pipe is usually used as beam,armrest,fence,and handrail ...