... ,600,8002. thickness(mm): 0.9,1.3,1.7,2.1,2.4,2.7,3.0,3 ... 05.Coefficient of vertical permeability(cm/s): k× (10-1 -~10-3)k=1.0-9.9No.ItemSpecificationNoteMass per square meter ... .2 8Vertical Permeability Coefficient cm/sk× (0.1 ~ 0.001)k=1.0-9.99Tear Strength KN ≥0.080.120 ... film cover,steep glue setting. Shell membrane surface treatmentFeatures:1.Acid and alkli resistance, erosion-resistance, anti-aging; ...