1 smoothly inside pipe，rugosity
coefficient:0.**9, little fluid drag force
2 Tensile Yield Streng, Anti-Pressure：Tensile
Yield Strength≥*0Mpa，softening
temp≥*9℃，Anti-Pressure、
3 Convenient installation：light
weight , convenient for tranportation and
connect。
4 Long working life : Storage or using outdoor for *0 years under
the pipe usage requirement
