How to choose high-quality geomembranes when the density of HDPE geomembrane is higher than that of LDPE produced anti-seepage or geomembrane? There are many specifications and varieties of geomembranes on the market, including national standards, enterprise standards, non national standards, American standards, and so on. Generally speaking, HDPE geomembrane appears much harder on the surface than LDPE. Both national and non national standards refer to the production of new or old materials. The surface of HDPE geomembrane produced from new materials is smooth and glossy, with high toughness and anti-seepage ability.