hdpe geomembrane with geotextile

HDPE geomembrane with geotextile is a composite geosynthetic lining system combining an impermeable high-density polyethylene membrane with a permeable geotextile layer. The system integrates containment, protection, filtration, and separation functions, widely used in environmental, mining, hydraulic, and infrastructure engineering projects.

Technical Parameters and Specifications

HDPE Geomembrane Parameters

• Raw material: High-density polyethylene (PE100 or equivalent)

• Thickness range: 0.75 mm – 3.0 mm

• Density: ≥0.94 g/cm³

• Tensile yield strength: ≥15 MPa (ASTM D6693)

• Elongation at break: ≥700%

• Carbon black content: 2.0–3.0%

• Oxidative induction time: ≥100 min (standard OIT)

• Hydraulic conductivity: ≤1×10⁻¹³ m/s

Geotextile Parameters

• Type: Nonwoven needle-punched / Woven

• Polymer: Polypropylene or polyester

• Mass per unit area: 200–800 g/m²

• Tensile strength: 10–50 kN/m

• CBR puncture resistance: 1.5–6.5 kN

• Permittivity: 0.5–2.5 s⁻¹

Structure and Material Composition

An HDPE geomembrane with geotextile system is designed as a functional composite rather than a single material.

Layered Structure

• Top layer: HDPE geomembrane providing liquid and gas containment

• Intermediate interface: Smooth or textured surface to enhance friction

• Bottom layer: Geotextile for cushioning, filtration, and subgrade protection

Material Functions

• Geomembrane resists chemical attack and UV exposure

• Geotextile distributes stress and prevents puncture damage

• Combined system improves long-term durability

Manufacturing Process

1. Raw Material Preparation

HDPE resin pellets and geotextile fibers are sourced according to project specifications and stored in controlled environments to prevent contamination.

2. Geomembrane Extrusion

Flat-die or blown-film extrusion lines form continuous HDPE sheets. Critical parameters include melt temperature, extrusion pressure, and thickness uniformity.

3. Geotextile Production

Fibers undergo carding, cross-lapping, and needle punching or weaving to achieve the required mechanical and hydraulic properties.

4. Composite Assembly

Geomembrane and geotextile layers are supplied separately or factory-laminated, depending on project requirements and installation methodology.

5. Quality Control

Finished products undergo tensile, puncture, permeability, and aging tests in accordance with ASTM and ISO standards.

Industry Comparison

Application Scenarios

• Distributors: Integrated lining systems for multiple project types

• EPC contractors: Reduced installation risk and simplified procurement

• Engineering firms: Predictable performance aligned with design models

• Importers and wholesalers: Standardized products with broad market demand

Core Pain Points and Solutions

• Puncture risk from subgrade: Mitigated by geotextile cushioning layer

• Leakage at liner interfaces: Addressed through compatible composite design

• Installation damage: Reduced by increased system robustness

• Long-term degradation: Controlled via UV-stabilized HDPE formulations

Risk Warnings and Mitigation Measures

Potential risks include insufficient geotextile mass, low-quality recycled resin, and improper field welding. These risks can be mitigated by specifying minimum standards, requiring factory test reports, and enforcing on-site quality assurance protocols.

Procurement and Selection Guide

1. Define containment and protection requirements

2. Select appropriate geomembrane thickness

3. Specify geotextile type and mass

4. Confirm compliance with ASTM or ISO standards

5. Request recent batch test reports

6. Evaluate supplier production capacity and logistics

7. Plan installation and quality control procedures

Engineering Application Example

In a mining tailings pond project, a 2.0 mm HDPE geomembrane combined with an 800 g/m² nonwoven geotextile was installed over compacted subgrade. The composite system provided effective seepage control and puncture resistance across a containment area exceeding 120,000 m².

Frequently Asked Questions (FAQ)

• Is the geotextile bonded to the geomembrane? It can be supplied bonded or loose.

• What geotextile weight is typical? 300–800 g/m² depending on subgrade conditions.

• Can recycled HDPE be used? Only if quality and traceability are controlled.

• Does the system resist chemicals? HDPE offers broad chemical resistance.

• Is UV protection required? Yes, especially for exposed applications.

• How are seams tested? Vacuum box, air pressure, or spark testing.

• What is the service life? Typically exceeds 30 years under proper conditions.

• Can the system handle settlement? Geotextile improves stress distribution.

• Are custom roll sizes available? Yes, within equipment limits.

• Is third-party testing recommended? Commonly required for public projects.

CTA – Commercial and Technical Requests

For detailed specifications, pricing, project-specific recommendations, or engineering samples of HDPE geomembrane with geotextile systems, procurement and engineering teams may submit formal requests for quotation or technical documentation.

E-E-A-T Author Statement

This content is developed by professionals with experience in geosynthetics manufacturing, quality assurance, and international infrastructure supply, supporting evidence-based decision-making for B2B engineering and procurement stakeholders.