Great Hdpe Geomembrane
1. Excellent Impermeability
Extremely low water vapor permeability. It blocks liquid and leachate migration, serving as the primary anti-seepage barrier. It can effectively isolate contaminated fluid from underlying soil and groundwater.
2. High Chemical Resistance
Resistant to acids, alkalis, salts, oils and most common organic contaminants. Not easily corroded by landfill leachate, mine wastewater and industrial sewage, suitable for harsh chemical environments.
3. Outstanding UV & Aging Resistance
Carbon black formulation endows strong ultraviolet resistance. Specially stabilized grades can work for long-term exposed or buried service, resisting oxidative aging.
HDPE Geomembrane Introduction
> HDPE geomembrane is a flexible impermeable barrier sheet mainly made of high-density polyethylene resin, with added carbon black, antioxidants, stabilizers and other additives, manufactured by extrusion and calendering. It is commonly known as impermeable membrane.
> National Standard: GB/T 17643-2025 Geosynthetics — Polyethylene Geomembranes
1. Material Characteristics
1. Excellent anti-seepage performance: Extremely low permeability coefficient (≤1×10⁻¹³ cm/s), nearly impermeable to water, serving as the core barrier layer for anti-seepage projects.
2. Chemical resistance: Resistant to acids, alkalis, salts, sewage, landfill leachate and oils, suitable for environments with contaminated media.
3. Anti-aging and UV resistance: Contains 2%~3% carbon black. When buried underground, its design service life can reach 50 years for long-term outdoor applications.
4. Low-temperature resistance: Operating temperature range -60℃ ~ +60℃, not prone to brittle cracking at low temperatures.
5. High toughness and high elongation at break: Elongation at break ≥600%, capable of adapting to uneven foundation settlement without cracking easily.
6. High puncture and tear resistance: Resists piercing by stones and hard objects. Better performance when matched with geotextile protection layer.
7. Good weldability: Weldable by double-track hot wedge welding and extrusion welding. Weld strength is no less than that of the base material, convenient for large-area construction.
8. Limitations: Rigid plastic sheet, prone to stress cracking after sharp bending; textured geomembrane has higher cost than smooth type; geotextile cushion must be installed for substrates with sharp particles.
2. Thickness / Width / Smooth & Textured Types
2.1 Common Thickness (mm)
0.3, 0.5, 0.75, 1.0, 1.5, 2.0, 2.5, 3.0
- Thin (0.3~0.75 mm): Landscape lakes, fish ponds, simple water tanks
- Medium (1.0~1.5 mm): Sewage tanks, regulating tanks, small solid waste storage yards
- Thick (2.0~3.0 mm): Municipal solid waste landfills, hazardous waste landfills, tailings ponds and other high-grade anti-seepage projects
2.2 Roll Width
Standard: 2m～8m, 8m is the mainstream size. Non-standard width can be customized. Roll length: 50/100/150 m. Wider rolls reduce field welds and lower leakage risks.
2.3 Smooth vs Textured
- Smooth HDPE geomembrane: Smooth on both sides; low friction coefficient; suitable for flat horizontal base; low cost and easy laying.
- Textured HDPE geomembrane: Single-sided or double-sided with granular protrusions on surface; high friction coefficient, specially used for slopes and inclined walls to prevent geomembrane sliding down the slope; preferred for landfill slopes.
3. Technical Parameter Table with Test Standards (GB/T 17643-2025)
| Test Item | Test Standard | Requirement for HDPE Geomembrane |
|---|---|---|
| Density | GB/T 1033.1 | ≥0.940 g/cm³ |
| Carbon Black Content | GB/T 13021 | 2.0%～3.0% |
| Carbon Black Dispersion | GB/T 18251 | No Grade 4 & 5 particles, ≤1 particle of Grade 3 |
| Tensile Yield Strength (MD & TD) | GB/T 1040.3 | Increases with thickness (Example: 1.5mm ≥16 N/mm; 2.0mm ≥20 N/mm) |
| Tensile Breaking Strength (MD & TD) | GB/T 1040.3 | 1.5mm ≥25 N/mm; 2.0mm ≥30 N/mm |
| Elongation at Break (MD & TD) | GB/T 1040.3 | ≥600% |
| Right-Angle Tear Load | GB/T 529 | 1.5mm ≥150N; 2.0mm ≥200N |
| Puncture Resistance | GB/T 19976 | 1.5mm ≥360N; 2.0mm ≥480N |
| Permeability Coefficient | GB/T 19979.2 | ≤1.0×10⁻¹³ cm/s |
| Environmental Stress Cracking Resistance (Notched Constant Tensile Load Method) | GB/T 18476 | Meet requirements of corresponding engineering grade |
> Note: Strength indicators increase gradually with thickness. Materials delivered to site shall be accompanied by factory certificate and third-party test report. On-site sampling re-inspection is available.
4. Application Scenarios & Material Selection
4.1 Application Scenarios
1. Environmental Solid Waste: Municipal solid waste landfill, hazardous waste landfill, fly ash landfill, tailings pond, ash residue yard for leachate anti-seepage.
2. Hydraulic Engineering: Reservoirs, artificial lakes, river channel anti-seepage, canals, dam anti-seepage, cofferdams.
3. Municipal Sewage: Sewage regulating tank, biochemical tank, sludge tank, rainwater storage tank.
4. Agriculture & Aquaculture: Fish ponds, shrimp ponds, water storage tanks, biogas digesters, biogas slurry tanks.
5. Others: Underground garage, green roof, salt pan brine anti-seepage, petrochemical storage tanks.
4.2 Selection Principles
1. Flat-bottom tanks, fish ponds, landscape lakes → Smooth HDPE; 0.5～1.0mm
2. Sewage tanks, regulating tanks → Smooth HDPE; 1.0～1.5mm
3. Landfills, tailings ponds (including slopes) → Textured HDPE for slopes, smooth HDPE for pond bottom; thickness ≥1.5~2.0mm; ≥2.0mm for hazardous waste projects
4. Substrate with crushed stones and sharp corners: Lay geotextile cushion under membrane to protect geomembrane against puncture.
5. Long-term exposed under sunlight: Prefer black HDPE with carbon black; cover with soil as much as possible to reduce UV aging.
5. Key Points for Welding & Installation
5.1 Base Surface Preparation
- Compact and smooth base surface, remove stones, tree roots and sharp debris; backfill and compact pits and depressions; keep dry, no ponding or sludge.
- Lay geotextile cushion for sharp substrate; geomembrane laying can only start after base acceptance.
5.2 Laying Requirements
- Lay from top to bottom along the slope; reserve expansion allowance to accommodate thermal expansion and cold contraction; avoid forced tension.
- Minimize welds. Longitudinal welds shall follow slope direction as priority. Adopt T-joint for weld intersection, cross joint is strictly prohibited. Reinforce T-joints by extrusion welding.
- Overlap width: 100mm±20mm for double-track hot wedge welding; 75mm±20mm for extrusion welding.
5.3 Two Welding Processes
1. Double-track Hot Wedge Welding (main weld, for long seams in large area)
- Two parallel welds with an air pressure test channel in the middle; preferred for main joints.
- Trial welding test pieces must be made before daily formal welding, peel and shear test shall be carried out. Welding temperature and speed can be locked only after qualified.
2. Manual Extrusion Welding (for details, repair, pipe penetration, T-joints)
- Manually extrude molten HDPE material, applied for corners, pipe surroundings, damage repair and positions inaccessible to double-track welding. Polish and clean the oxidized layer on membrane surface before welding.
6. Company Profile
Our company has successfully completed ISO 9001 quality management system certification. Some of our exported products have received SGS certification and patent certificates.
The company's main markets are Southeast Asia, Europe, and North and South America. Exclusive distributors have been established in Indonesia and Kuwait. Due to continued business expansion, a branch of Taian YPHB, specializing in foreign trade import and export operations, was opened in 2022 in the provincial capital of Jinan.
