What material is often used for liners in landfill design?

High-density polyethylene (HDPE) is commonly used for liners in landfill design due to its excellent chemical resistance, durability, and low permeability. These properties are essential for liner materials, as they must effectively contain leachate and prevent contamination of surrounding soil and groundwater. HDPE liners are also resistant to punctures and tears, which can occur in a landfill environment, further enhancing their effectiveness in waste containment.

In comparison, while other materials like polyethylene terephthalate (PET) and linear low-density polyethylene (LLDPE) have their own applications, they do not possess the same level of strength and resistance required for landfill liners. Polystyrene (PS) is primarily used in different contexts, such as packaging and insulation, rather than in landfill liner systems. Therefore, HDPE is the preferred choice for landfill liners focused on environmental protection and waste management efficiency.