1.Service life of more than 100 years;
2.Flexible interface.Excellent antu-vibration fratures,suitable for anti-seismic protection in high bulidings;
3.Sealing.When the hydraulic test lasts over 30mins and the pressure inside the pipe is greater than 0.4mpa,there is no leakage
4.Light weight. Layout length 20-30% greater than sand casting pipes; 
5.Axia movement.When the pressure inside the pipe is greater than 0.4mpa and the lasting time is 5mins,there is no leakage under the condition of 35mm movenment along axial direction.