500 micron Pond Liner
1. High cost-effectiveness: The material and construction costs in the early stage are controllable, and there is less maintenance demand in the later stage. The service life can reach 20-50 years, and the long-term economy is outstanding.
2. Strong functional compatibility: It can be used in combination with other geotechnical materials such as geotextiles and geogrids, while achieving composite functions such as anti-seepage, reinforcement, and drainage.
3. Environmental compliance standards: Geomembranes that meet environmental standards (such as HDPE geomembranes) do not release harmful substances during use and can be recycled after disposal, with minimal impact on the environment.
Product Introduction:
500 micron Pond Liner is a thin film geosynthetic material made by processing high molecular weight polymers (such as polyethylene, polyvinyl chloride) or their blends through extrusion, rolling and other processes. It differs from the "filtering and drainage" function of geotextiles in that its core value lies in actively blocking medium migration. It can be divided into two categories: "smooth surface geotextile membrane" and "rough surface geotextile membrane". The former focuses on anti-seepage, while the latter increases the friction coefficient and is suitable for sliding scenarios such as slopes.
The core quality indicators include permeability coefficient (usually required to be ≤ 1 × 10 ⁻¹¹ cm/s), tensile strength (≥ 10MPa), and elongation at break (≥ 400%), which directly determine the anti-seepage effect and service life of the project.
Main Features
1. Anti leakage performance: The ultimate barrier molecular structure is tightly packed without pores, and its barrier performance against media such as water, organic solvents, and acid-base solutions far exceeds that of traditional clay anti-seepage layers. Taking high-density polyethylene (HDPE) geomembrane as an example, its permeability coefficient is only 1 × 10 ⁻¹³ cm/s, equivalent to a 1-meter-thick geomembrane, and its anti-seepage effect is equivalent to a 50 meter thick clay layer.
2. Physical and mechanical properties: stable and resistant to manufacturing
Tensile and tear resistance: Under external forces such as soil settlement and construction compaction, it can absorb stress through its own deformation and is not easily broken;
Weather resistance: After adding antioxidants and UV stabilizers, it can be used for a long time in an environment ranging from -40 ℃ to 60 ℃, avoiding high temperature aging or low temperature brittleness;
Corrosion resistance: It has good tolerance to strong acids (pH ≥ 2), strong alkalis (pH ≤ 12), and common industrial chemicals (such as salt solutions and detergents).
3. Construction and adaptability: flexible and efficient
Lightweight (HDPE geomembrane weighs about 0.8-1.5kg per square meter), easy to transport and lay, and can be operated by a single person;
Good flexibility, bendable and foldable, able to closely fit uneven terrain (such as dam slopes, irregular foundations of landfills);
The splicing technology is mature, and the weld strength can reach more than 80% of the base material through hot welding, hot melt welding or special adhesive connection, avoiding leakage at the splicing point.
4. Environmental Protection and Durability: Long term Reliability
Geomembranes that meet national environmental standards (such as food grade HDPE membranes) do not release harmful substances such as formaldehyde and heavy metals, and can be used in scenarios such as drinking water tanks and aquaculture ponds;
Under normal working conditions, the service life can reach 30-50 years, and there is no need for frequent maintenance in the later stage. Only regular inspections of welds and surfaces are required to check for damage.
Product Parameters:
Metric | ASTM | unit | Test value | Minimum test frequency | ||||||
test method | 0.75 mm | 1.00 mm | 1.25 mm | 1.50 mm | 2.00 mm | 2.50mm | 3.00 mm | |||
Minimum average thickness | D5199 | mm | 0.75 | 1 | 1.25 | 1.5 | 2 | 2.5 | 3 | Per volume |
Minimum value (any one of 10) | -10% | -10% | -10% | -10% | -10% | -10% | -10% | |||
minimum density | D 1505/D 792 | g/cm3 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 0.94 | 90,000 kg |
Minimum average tensile performance (1) | D638 Type IV | |||||||||
Breakage strength, | N/mm | 20 | 27 | 33 | 40 | 53 | 67 | 80 | 9,000 kg | |
yield strength | N/mm | 11 | 15 | 18 | 22 | 29 | 37 | 44 | ||
Strain extension, | % | 700 | 700 | 700 | 700 | 700 | 700 | 700 | ||
yield extension | % | 12 | 12 | 12 | 12 | 12 | 12 | 12 | ||
Minimum strength of right-angle tear | D 1004 | N | 93 | 125 | 156 | 187 | 249 | 311 | 374 | 20,000 kg |
Minimum puncture strength | D4833 | N | 240 | 320 | 400 | 480 | 640 | 800 | 960 | 20,000 kg |
Constant tensile load stress cracking (2) | D5397 | hour | 300 | 300 | 300 | 300 | 300 | 300 | 300 | Based on GRI GM-10 |
Carbon black content | D 1603(3) | % | 2.0-3.0 | 2.0-3.0 | 2.0-3.0 | 2.0-3.0 | 2.0-3.0 | 2.0-3.0 | 2.0-3.0 | 9,000 kg |
Carbon black dispersion | D5596 | Note (4) | Note (4) | Note (4) | Note (4) | Note (4) | Note (4) | Note (4) | 20,000 kg | |
Oxygen induction time (OIT) (5) | 90,000 kg | |||||||||
(a) Standard OIT | D3895 | minute | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
（b） high-handed OIT | D5885 | minute | 400 | 400 | 400 | 400 | 400 | 400 | 400 | |
85℃ Oven aging (minimum average) (5)(6) | Per formula | |||||||||
(A) Standard OIT is retained after 90 days | D 5721 | % | 55 | 55 | 55 | 55 | 55 | 55 | 55 | |
(B) High voltage OIT is retained for 90 days | D 3895 D5885 | % | 80 | 80 | 80 | 80 | 80 | 80 | 80 | |
Ultraviolet resistance (7) | Per formula | |||||||||
（a） standard OIT | D3895 | Note (8) 50 | ||||||||
(b) Retention of high pressure OIT after 1600 hours (9) | D5885 | % | ||||||||
Product Applications:
1. Water conservancy and hydropower engineering
Reservoirs and artificial lakes: Laying geomembranes at the bottom and slopes of the reservoir area to prevent water leakage underground, especially suitable for areas with poor geological conditions (such as sandy soil layers), can reduce water resource loss rates to below 1%.
Irrigation channel: replacing traditional concrete or clay lining, reducing leakage losses during channel water delivery, with a water-saving rate of up to 30% -50%, while reducing channel maintenance costs.
Dam anti-seepage: Laying geomembranes on the upstream face of the dam or inside the dam body to block the infiltration of floods or reservoir water into the dam body, avoiding dangerous situations such as landslides and pipe surges caused by the rise of the seepage line of the dam body.
2. Environmental engineering
Landfill site: This is one of the most critical application scenarios. The composite anti-seepage structure of "geomembrane+geotextile+bentonite waterproof blanket" is adopted and laid at the bottom and periphery of the landfill site to completely isolate the leachate from the soil and groundwater, preventing heavy metal and harmful organic matter from polluting the groundwater.
Wastewater treatment plant: used as an anti-seepage lining for oxidation tanks, sedimentation tanks, and sludge concentration tanks to prevent sewage leakage during the treatment process, and to prevent underground sewage from seeping back into the treatment system, ensuring treatment efficiency.
Hazardous waste disposal site: For toxic and hazardous waste, chemical resistant special geomembranes (such as HDPE film) should be used to form double or triple anti-seepage barriers to eliminate the risk of pollutant leakage.
3. Transportation Engineering
Highway and railway subgrade: Lay geotextile at the base of the subgrade to block the rise of groundwater level or rainwater infiltration, avoid subgrade softening and settlement, and reduce pavement cracking, collapse and other diseases.
Tunnel engineering: As a waterproof board for tunnels (mostly made of EVA material), it is laid between the initial support and secondary lining of the tunnel to prevent water seepage from the mountain from entering the interior of the tunnel and ensure driving safety.
Underground pipe gallery: used as an anti-seepage layer on the side walls and bottom of the pipe gallery, isolating groundwater, avoiding water accumulation inside the pipe gallery, and protecting pipelines (such as cables and gas pipes) from water erosion damage.
4. Agriculture and Aquaculture
Water saving irrigation: Laying geomembranes in reservoirs and irrigation channels to reduce water leakage, especially suitable for arid and semi-arid areas, and improve irrigation water utilization efficiency.
Aquaculture pond: Use food grade HDPE geomembrane to lay the bottom of fish ponds and shrimp ponds, replacing traditional cement ponds. Not only can it prevent water leakage, but it can also reduce the accumulation of silt at the bottom of the pool, reduce the difficulty of cleaning, and avoid the impact of cement tanks on water quality, thus improving the quality of aquatic products.
Saline alkali land improvement: Laying geomembranes on the surface layer of saline alkali land to isolate the rising of underground saline alkali water, and cooperating with freshwater salt washing to quickly improve the soil and create conditions for crop planting.
5. Mining and Energy Engineering
Tailings pond: Wear resistant and corrosion-resistant geomembranes are laid at the bottom and dam body of the tailings pond to prevent heavy metals (such as lead and zinc) and harmful chemicals in the tailings slurry from penetrating into the surrounding soil and water sources.
Petrochemical storage tank: Lay geomembrane under the foundation of the tank to form an anti-seepage isolation layer, preventing the leakage of crude oil and chemical raw materials from the tank from seeping into the ground and avoiding environmental pollution accidents.
Biogas digester: The anti-seepage lining of the biogas digester is constructed with geomembrane to ensure the airtightness of the digester, reduce biogas leakage, and prevent sewage leakage, thereby improving biogas production efficiency.
In summary, the application of geomembranes is a model of modern engineering technology, which provides key technical solutions for global challenges such as water resource conservation and environmental pollution prevention with its reliable performance and economy.
