Generally, you can buy it after confirming the width of it. The width is more important since the length is infinite. Usually they often use 4- and 6-meter-width geomembranes. And then they use products which have an appropriate width. Products they use are mostly cheap, such as: Composite geotechnical membranes use two cloths film one film of 400, 500 and 600 grams. HDPE geomembranes use 0.5mm membranes to prevent Puncture and rupture. General specifications are as follows: one cloth and one membrane 0.4mm/200, 0.4mm/300, two cloths film one film 600g/700g/800g. Geomembranes without cloth use membranes which are more than 0.5mm, for example: 0.7 mm, 0.75 mm, 0.8 mm, it is thick and has a better performance in use. And the service life will also be longer. Also such technology as HDPE seepage-proof membranes, composite geomembranes, seepage-proof geomembranes and geomembranes are also applicable to fish, shrimp ponds, aquatic farms, ricefield eels and loaches ponds, sea cucumber ponds,etc.
1 tensile strength Mpa≥17≥25 2 breaking elongation≥450≥550 3 angle tear strength N/mm≥80≥110 4 carbon black content%≥2 5 environmental stress crack resistanceF20h?≥1500???? 6 oxidation induction time in 200℃min?≥20???? 7 water vapor permeability coefficientg﹒cm/(cm﹒s﹒Pa)?≤1.0×10-12≤1.0×10—16???? 8 low temperature brittleness in minus 70 degrees approved 9 dimensional stability%±3
The thickness of HDPE geomembranes can be 0.75 mm, 1.0 mm, 1.25 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5mm and so on. In accordance with the national standard of CJ/T234-2006, and from the actual situation, the recommended thickness of the HDPE membranes should be no less than 1.5 mm at least, and be within the error of plus or minus 3%. According to my previous experience, the thickness of 1.5 mm and 2.0 mm are often used in landfill sites. Of course, geomembranes with different thickness are used in the different parts of landfill sites, which can mainly be used for the seepage-proof control of substrates, side slopes, and closure covers. Different membranes are used in different parts of the landfill sites, such as smooth membranes are used in substrates, rough membranes are used in slopes. In addition, the choices of thickness are influenced by many other factors, such as the terrain, soil, impervious materials, impervious requirements of landfill sites and so on.
