Jul 22, · HDPE is the abbreviation of high density polyethylene, so it is also called high density polyethylene geomembrane. The thickness of HDPE geomembrane is 0.2 mm – 3 mm. The HDPE geomemebrane liner with thickness more than 2mm is also called HDPE polythene sheet. The HDPE geomembrane liner is the most st effective and adaptable liners available.