Triple-wall pipe can be used for many applications and unaffected by extended exposure to the suns heat and ultraviolet radiation, it is immune to freeze/thaw conditions while the characteristics of HDPE allows it to be corrosion resistant to acids, alkalis, and salts, and will not rust. Triple-wall pipe is made of three bonded layers to provide exceptional pipe stiffness the smooth inner wall, corrugated structural core, smooth outer wall provide strength-to-weight ratio and stiffness rating at least double that of any competitive pipe.