1 it has very good performance to resisit the creep change of the  plastics can be used for more than 60 years .

2easy to be bent5 and stretched as the metal pipes ,not necessary to b heated when bent.

3 resistant to high temperature and high pressure , not easy to be distortd, can be used underground and throughout the walls with great safety and reliability.

4wide scope of working temperature , from -40to 110, excellent   performance under high tempeature environment.