light weight, high stength,corrosion resistance,antistatic and anti frame.Its service life is more than 30 years. FRP stairwell has advantageof light weight, high stength,corrosion resistance,antistatic and anti frame. short installation period ,easy maintenance, etc Its service life is more than 30 years. It is especially suitable for humid and acidic enviroment.FRPstairwell consist of crossbeam ...