High-Density Polyethylene (HDPE) Geomembrane:
Characteristics: It has relatively high strength and good chemical corrosion resistance, and can maintain stable performance in different soil and water quality environments. Its anti-puncture ability is relatively strong, and it is not easily punctured by sharp objects existing on the bottom or walls of the reservoir. Moreover, it has good anti-aging performance and a relatively long service life, and can provide reliable anti-seepage protection for reservoirs for a long time. For example, in some large open-air agricultural irrigation reservoirs, even after being exposed to long-term sunlight, rain, and the influence of various substances in the soil, the HDPE geomembrane can still effectively play its anti-seepage role.
Applicable Scenarios: It is widely used in reservoirs of all sizes. It is suitable for both small household reservoirs and large reservoirs for industrial water use, agricultural irrigation water storage and other purposes.
Low-Density Polyethylene (LDPE) Geomembrane:
Characteristics: It has excellent flexibility, which is convenient for laying and construction. It can better conform to the complex shapes and irregular surfaces of the bottom and walls of the reservoir, and can effectively reduce the generation of wrinkles during the laying process. Meanwhile, its cost is relatively low. However, its strength and chemical corrosion resistance are slightly inferior to those of the HDPE geomembrane. For example, in the construction of some small reservoirs that are temporary or have relatively low requirements for anti-seepage, the LDPE geomembrane will be selected considering cost factors.
Applicable Scenarios: It is more suitable for small reservoirs that have relatively low requirements for bearing pressure and have a relatively short service life, such as small rainwater collection reservoirs in rural areas.
Polyvinyl Chloride (PVC) Geomembrane:
Characteristics: It has good elasticity and weather resistance, and has a strong adaptability to the environment. And different additives can be added according to needs to further improve its performance in certain aspects. For example, adding a flame retardant can make it have certain flame retardant characteristics. However, more attention may need to be paid to its environmental protection aspect. Some inferior PVC geomembranes may release harmful components during use.
Applicable Scenarios: It is often used in reservoirs with special performance requirements. For example, reservoirs built around places with fire prevention requirements, or reservoirs with high requirements for weather resistance and in environments with changeable climates.
Performance Indicators
Thickness: The thickness of common anti-seepage geomembranes is generally between 0.5mm and 2.0mm. Thinner geomembranes are usually suitable for small reservoirs with relatively low anti-seepage requirements. For large reservoirs that bear greater water pressure and need to be used for a long time, thicker geomembranes, such as those with a thickness of 1.5mm - 2.0mm, are often selected to ensure sufficient strength and anti-seepage ability.
Width: Its width is generally between 4m and 6m. An appropriate width helps to reduce the number of splicing of the geomembrane during the construction process, improve construction efficiency, and at the same time can better ensure the overall anti-seepage effect and avoid the potential leakage hazards caused by too many splicing parts.
Tensile Strength: This is an indicator to measure the ability of the geomembrane to resist damage when subjected to tensile forces. High-quality anti-seepage geomembranes need to have sufficient tensile strength to cope with the tensile forces that may be generated during the use of the reservoir due to factors such as foundation deformation and changes in water pressure, so as to prevent the geomembrane from being torn and causing leakage.
Elongation at Break: It reflects the elongation ability of the geomembrane when stretched until it breaks. A higher elongation at break means that the geomembrane has better flexibility and deformation adaptability. For example, when a certain degree of uneven settlement occurs in the reservoir, the geomembrane can adapt through its own elongation and deformation, and will not easily break and lose its anti-seepage function.
Anti-puncture Strength: Since there may be sharp objects such as stones and branches on the bottom and walls of the reservoir, the geomembrane needs to have good anti-puncture ability to avoid being punctured by these sharp objects and thus ensure the anti-seepage effect.
