... and thermal stability4.Corrosion resistance, anti-corrosion treatment, long service life.5.Inside sleek, low resistance, water circulation ability, ... .Low-temperature impact resistance, good performance in - 20 to 40 degrees Celsiustemperature range, winter construction safe use unaffected,8 ... way and directional drilling pipe and tube,pipe line, etc, to an new non-excavation technology,10.The PE ...