In complex geotechnical engineering, subsurface tunneling, building foundation waterproofing, and geometric concrete reservoir lining projects in 2026, installation substrates often feature sharp 90-degree angles, irregular topography, or severe differential ground subsidence. Applying rigid containment sheets under these conditions causes localized stress concentration and catastrophic liner puncture. SherkatTrade LLDPE Geomembrane Sheet Liners (Linear Low-Density Polyethylene Containment Membranes), manufactured to international GRI-GM17 standards, provide the most ductile, elastomeric polymeric barrier designed to eliminate stress fractures across uneven terrain.
Manufactured at our polymer converting complex in Isfahan from 100% virgin linear low-density polyethylene resin compounded with 2.5% fine-particle carbon black (Carbon Black N-550/N-660) and synergistic antioxidant/HALS light stabilizers, these sheets deliver superior elongation (>800%), unmatched Environmental Stress Crack Resistance (ESCR > 1000 hours), and sub-zero flexibility down to -45°C.
Every production master roll is accompanied by a certified laboratory Quality Test Report (QTR) verified under ASTM and GRI-GM17 testing protocols:
| Project Infrastructure | Recommended Thickness | Surface Texture | Strategic Engineering Benefit |
|---|---|---|---|
| Concrete Tanks & Geometric Reservoirs | 1.0 mm to 1.5 mm | Smooth (Both sides) | Effortless contouring around 90° corners and vertical walls without fold stress |
| Municipal & Industrial Landfill Caps (Capping) | 1.5 mm | Textured (One/Both sides) | Adapts dynamically to decomposing refuse subsidence while shedding rainwater |
| Deep Basements, Tunnels & Green Roofs | 1.5 mm to 2.0 mm | Smooth Root-Resistant | High resistance to tree root penetration and lateral hydrostatic groundwater pressure |
| Irrigation Canals in Subsidence-Prone Soil | 1.5 mm to 2.0 mm | Smooth Flexible | Preserves hydraulic containment during uneven canal bank settlement |
| Performance Parameter | LLDPE Geomembrane (GRI-GM17) | HDPE Geomembrane (GRI-GM13) |
|---|---|---|
| Flexibility & Pliability | Extremely high, rubber-like flexibility | Semi-rigid, stiff structure |
| Stress Crack Resistance (ESCR) | Outstanding (> 1000 hours) | High (> 500 hours) |
| Elongation at Break | > 800% (Superior ground settlement adaptation) | > 700% |
| Ease of Corner Installation | Very easy, bends without pre-heating | Requires careful pre-heating & relief cuts |
| Yield Tensile Strength | Moderate to high | Very high (best for deep dams) |
| Primary Recommended Use | Landfill capping, concrete tanks, tunnels, basements | Large flat earth reservoirs, mining acid ponds |
The remarkable elastomeric flexibility prevents stress concentration along welded seams in unstable soils.
Around pipe penetrations, sump pits, and retaining columns, LLDPE sheets form clean boots and weld seamlessly with hand extruders.
Complete chemical immunity against biogenic methane gases, soil acids, aggressive micro-organisms, and solar UV radiation.
LLDPE is strongly recommended for geomembrane applications with severe differential settlement (landfill capping), angular concrete tank linings, tunnel water barriers, and sub-zero cold regions.
No, SherkatTrade LLDPE geomembrane contains the identical 2.5% carbon black and antioxidant package, delivering the same 50+ year outdoor service life.
Yes, by adjusting the temperature and speed settings of hot-wedge welding equipment, HDPE and LLDPE form a continuous, homogeneous, and leak-proof weld.
Contact the SherkatTrade geosynthetics and water containment engineering team to receive site-specific thickness evaluations and bulk pricing:
| Material | Linear Low-Density Polyethylene (LLDPE) Geomembrane |
| Available Thicknesses | 0.75mm, 1.0mm, 1.5mm, 2.0mm, 3.0mm |
| Roll Width | 5.8m / 6.0m |
| Roll Length | 50m - 100m |
| Color | Black |
| UV Stabilized | Yes |
| Flexibility | Extremely High |
| Standard Compliance | GRI-GM17 Standard |
| Estimated Lifespan | 50+ Years |
