HDPE geomembrane 1,good waterproof, drainage, 2.0.2mm to 2.0mm 3,ASTM standard 4,ISO certificate HDPE geomembraneFlat surface high- ... anti-seepage of canal, vertical central wall, side slope, etc.).3. Municipal projects (underground project of subway and structure, anti-seepage ... of plantation roof and roof garden, lining of sewage pipe, etc.).4. Landscape garden (man-made lake, river way, ...