Polyethylene geomembranes are classified according to their densities. High-Density Polyethylene (HDPE) is commonly used. There are also varieties such as Low-Density Polyethylene (LDPE), Linear Low-Density Polyethylene (LLDPE), Very Low-Density Polyethylene (VLDPE), and Medium-Density Polyethylene (MDPE). They stand out for their resistance to chemicals, UV durability, resistance to both organic and inorganic solvents, and resilience against punctures and cracks. They are unaffected by hot-cold cycles and are easily applicable in the field.