Linear Low Density Polyethylene (LLDPE) Geomembrane
Short Description:
Linear low-density polyethylene (LLDPE) geomembrane is a polymer anti-seepage material made of linear low-density polyethylene (LLDPE) resin as the main raw material through blow molding, cast film and other processes. It combines some of the characteristics of high-density polyethylene (HDPE) and low-density polyethylene (LDPE), and has unique advantages in flexibility, puncture resistance and construction adaptability.
Linear low-density polyethylene (LLDPE) geomembrane is a polymer anti-seepage material made of linear low-density polyethylene (LLDPE) resin as the main raw material through blow molding, cast film and other processes. It combines some of the characteristics of high-density polyethylene (HDPE) and low-density polyethylene (LDPE), and has unique advantages in flexibility, puncture resistance and construction adaptability.
Performance Characteristics
Excellent Seepage Resistance
With a dense molecular structure and low permeability coefficient, LLDPE geomembrane can effectively prevent liquid leakage. Its seepage - proof effect is comparable to that of HDPE geomembrane, making it widely applicable to projects requiring seepage control.
Good Flexibility
It exhibits outstanding flexibility and is not easily brittle at low temperatures, with a temperature resistance range of approximately - 70°C to 80°C. This allows it to adapt to irregular terrains or environments with dynamic stress, such as water conservancy projects in mountainous areas with complex terrains.
Strong Puncture Resistance
The membrane has strong toughness, and its tear and impact resistance are better than those of HDPE smooth membranes. During construction, it can better resist punctures from stones or sharp objects, reducing accidental damage and improving the reliability of the project.
Good Construction Adaptability
It can be connected by hot - melt welding, and the joint strength is high, ensuring the integrity of seepage prevention. At the same time, its good ductility makes it easy to bend and stretch during construction, and it can better fit complex bases such as uneven soil bodies and foundation pit slopes, reducing the construction difficulty.
Good Chemical Corrosion Resistance
It has a certain ability to resist the corrosion of acid, alkali, and salt solutions, and is suitable for most conventional seepage - proof scenarios. It can withstand the erosion of various chemical substances to a certain extent and prolong the service life.
Application Fields
Water Conservancy Projects
It is suitable for the seepage - proof projects of small and medium - sized reservoirs, channels, and storage tanks, especially in areas with complex terrains or uneven settlement, such as the construction of check dams on the Loess Plateau, where its good flexibility and seepage - proof performance can be brought into play. For temporary or seasonal water conservancy projects, such as drought - emergency storage tanks, its advantages of convenient construction and relatively low cost make it an ideal choice.
Environmental Protection Projects
It can be used as a temporary seepage - proof layer for small landfills, seepage - proof for regulating ponds, and linings for industrial wastewater ponds (in non - strongly corrosive scenarios), helping to prevent the leakage of pollutants and protect the surrounding environment.
Agriculture and Aquaculture
It is widely used in the seepage prevention of fish ponds and shrimp ponds, which can effectively prevent water leakage and improve the utilization efficiency of water resources. It can also be used for the seepage prevention of agricultural irrigation storage tanks, biogas digesters, and the moisture - proof and root - isolation at the bottom of greenhouses, and can adapt to the slight deformation of the soil due to its flexibility.
Transportation and Municipal Engineering
It can be used as a moisture - proof layer for roadbeds, replacing traditional gravel layers and reducing project costs. It can also be used for the seepage - proof isolation of underground pipe trenches and cable tunnels to protect underground facilities from water erosion.
LLDPE Geomembrane Industry Parameter Table
| Category | Parameter | Typical Value/Range | Test Standard/Description |
|---|---|---|---|
| Physical Properties | Density | 0.910~0.925 g/cm³ | ASTM D792 / GB/T 1033.1 |
| Melting Range | 120~135℃ | ASTM D3418 / GB/T 19466.3 | |
| Light Transmittance | Low (black membrane is nearly opaque) | ASTM D1003 / GB/T 2410 | |
| Mechanical Properties | Tensile Strength (Longitudinal/Transverse) | ≥10~25 MPa (increases with thickness) | ASTM D882 / GB/T 1040.3 |
| Elongation at Break (Longitudinal/Transverse) | ≥500% | ASTM D882 / GB/T 1040.3 | |
| Right Angle Tear Strength | ≥40 kN/m | ASTM D1938 / GB/T 16578 | |
| Puncture Resistance | ≥200 N | ASTM D4833 / GB/T 19978 | |
| Chemical Properties | Acid/Alkali Resistance (pH Range) | 4~10 (stable in neutral to weak acid/alkali environments) | Laboratory testing based on GB/T 1690 |
| Resistance to Organic Solvents | Moderate (not suitable for strong solvents) | ASTM D543 / GB/T 11206 | |
| Oxidation Induction Time | ≥200 min (with anti-aging additives) | ASTM D3895 / GB/T 19466.6 | |
| Thermal Properties | Service Temperature Range | -70℃~80℃ | Long-term stable performance within this range |
| Common Specifications | Thickness | 0.2~2.0 mm (customizable) | GB/T 17643 / CJ/T 234 |
| Width | 2~12 m (adjustable by equipment) | Manufacturing standard | |
| Color | Black (default), white/green (customizable) | Additive-based coloring | |
| Seepage Performance | Permeability Coefficient | ≤1×10⁻¹² cm/s |
