To perform in accordance with design requirements like design thickness of 0.5mm geomembrane geomembrane design requirements to be procured 0.5mm geomembrane standard GB / T17643-2011 standards or CJ / T234-2006 standards in accordance with the requirements of the standard deviation as the thickness of 0.5mm geomembrane thickness limit deviation -10%, or thin spots can be lower than the average thickness of 0.45mm design requirements geomembrane standard deviation 0 American standard GRI GM-13 standard 0.5mm geomembrane allows less than 0.5mm thickness of 0.5mm site must be