... ,high strength insulation long use life fiberglass square pipe hollow fiberglass pipe is usually used as beam,armrest ... and high strengthUV resistanceCustomizationSafetyInsulationEconomy Characteristic Applicationfiberglass square pipe hollow fiberglass pipe can be applied as beams,handrail, ... armrest,ladder,measuring instrument etc. Pultruded fiberglass pipe is usually used as beam,armrest,fence,and ...