1) Non-conductive: good insulation, assuring a safe system. 2) Smooth surface: small friction coefficient to ensure the cables go through smoothly. 3) Fire resistance: self-extinguishing, do not support combustion. 4) Corrosion Resistance: resistant to acids, bases and salts, assuring a lower maintenance cost and a longer performance life. 5) Impact strength: resistant to compression and impact, suitable to be buried in concrete. 6) Easy Installation: light weight, easy to cut, transport, bent and handle; connecting by solvent cement and threading joining.