ENVIROMATE® Smooth Geomembrane liners are made from superb 100% virgin HDPE or LLDPE resin which is for geomembrane in GRI GM-13 or GM17 standard specifically and produced along with over 2.0 % carbon black, antioxidant, and stabilizers to have superior mechanical properties and outstanding long-term resistance to chemical, ozone, oxidation, environmental stress crack, and UV resistance.