The OPVC pipe is a pipe produced by the bidirectional stretching process.The raw material formulation of the pipe is bascally the same as that of theordinary PVC-U pipe. The perfomance of the pipe produced by this proces is greatly improved compared with PVC-U pipe,the impact resitance of thepipe is improved by about 4 times,the toughness is maintained at minus -20 ” C, and the wall hickness of PVC-U pipe is reduced by alf under thesame pressure. About 47% of the raw material is saved, and a thinner wall thickness means that the pipes water conveying capacity is stronger, the pipes are lighter and more convenient to install, and the transportation cost is lower.