HDPE is short for High-Density Polyethylene, a hard, rugged plastic with excellent chemical and UV stability. HDPE geomembranes are employed as liners in most containment scenarios—ponds, canals, landfills, and mining facilities come to mind. They function as barriers to keep from leaking or contaminating, keeping all things in line below the surface.It provides a perfect balance of durability, flexibility, and chemical resistance. But, like most technical materials, knowing what to look for and how to procure it correctly can be a make-or-break aspect of your project. Let's work through what HDPE geomembranes are actually made of, how the pricing is influenced, and how to find good sources in a competitive and convoluted marketplace.