High Density Polyethylene Geomembrane

Product Definition

High Density Polyethylene Geomembrane is an impermeable synthetic liner manufactured from high-density polyethylene resin, engineered to provide long-term containment, waterproofing, and environmental protection in civil, mining, hydraulic, and infrastructure engineering projects.

Technical Parameters and Specifications

Typical engineering-grade High Density Polyethylene Geomembrane parameters used in design and procurement include:

• Material: High-density polyethylene (HDPE)

• Density: ≥ 0.94 g/cm³

• Thickness Range: 0.5 mm – 3.0 mm

• Standard Roll Width: 5.0 m – 8.0 m

• Roll Length: 50 m – 200 m

• Tensile Strength at Yield: ≥ 15 MPa

• Elongation at Break: ≥ 700%

• Puncture Resistance: ≥ 300 N

• Carbon Black Content: 2.0% – 3.0%

• Oxidative Induction Time (OIT): ≥ 100 minutes

• Design Service Life: ≥ 50 years

Structure and Material Composition

High Density Polyethylene Geomembrane is a homogeneous polymer sheet designed for chemical and mechanical stability:

• HDPE Polymer Matrix: Provides impermeability and tensile strength

• Carbon Black: Enhances UV resistance and weather durability

• Antioxidant System: Delays thermal and oxidative degradation

• Surface Options: Smooth or textured for slope friction control

Manufacturing Process

The production of High Density Polyethylene Geomembrane follows standardized industrial procedures:

1. Raw Material Selection: Virgin or controlled recycled HDPE resin

2. Compounding: Blending with carbon black and stabilizers

3. Extrusion: Flat-die or blown film extrusion forming continuous sheets

4. Surface Texturing: Optional embossing for increased interface friction

5. Cooling and Thickness Control: Ensures uniformity

6. Online Quality Monitoring: Thickness and defect detection

7. Mechanical Testing: Tensile, tear, puncture, and OIT verification

8. Rolling and Packaging: Controlled winding for transport safety

Industry Comparison

Application Scenarios

High Density Polyethylene Geomembrane is widely specified by EPC contractors, consultants, and distributors for:

• Municipal and hazardous waste landfill liners

• Mining tailings storage facilities and heap leach pads

• Industrial wastewater treatment ponds

• Reservoirs, canals, and irrigation systems

• Aquaculture ponds and water storage lagoons

• Secondary containment for chemical storage

Core Pain Points and Engineering Solutions

• Leakage Control: Near-zero permeability prevents fluid migration

• Chemical Attack: HDPE resists acids, alkalis, and hydrocarbons

• UV Degradation: Carbon black stabilization ensures long-term exposure resistance

• Subgrade Movement: High elongation accommodates settlement and deformation

Risk Warnings and Mitigation Measures

• Ensure subgrade is smooth and free of sharp objects

• Use protective geotextile layers where puncture risk exists

• Employ certified welding technicians for seam installation

• Allow thermal expansion during high-temperature installation

Procurement and Selection Guide

1. Define containment function and regulatory requirements

2. Select thickness based on hydraulic head and loading

3. Determine surface texture requirements for slopes

4. Verify compliance with ASTM and ISO standards

5. Review manufacturer quality control documentation

6. Confirm availability of installation and seam testing support

Engineering Case Study

A mining tailings pond project adopted a 2.0 mm High Density Polyethylene Geomembrane installed over a compacted subgrade with needle-punched geotextile protection. Hot wedge welding with dual seams and air pressure testing ensured seam integrity. After multiple operational cycles, monitoring confirmed zero leakage.

Frequently Asked Questions

• Q1: What makes HDPE geomembrane impermeable?
  A: Its dense polymer structure provides near-zero permeability.

• Q2: What thickness is most common?
  A: 1.0–2.0 mm for most containment projects.

• Q3: Is it suitable for chemical exposure?
  A: Yes, HDPE has excellent chemical resistance.

• Q4: Can it be used in exposed conditions?
  A: Yes, UV stabilization allows long-term exposure.

• Q5: How are seams joined?
  A: By hot wedge or extrusion welding.

• Q6: Is textured geomembrane necessary on slopes?
  A: Recommended where slope stability is critical.

• Q7: What standards apply?
  A: ASTM D638, D6693, D5885, ISO equivalents.

• Q8: Can damaged areas be repaired?
  A: Yes, with localized patch welding.

• Q9: How long does it last?
  A: Over 50 years under standard service conditions.

• Q10: Is geotextile always required?
  A: Recommended where puncture risk exists.

Call to Action

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E-E-A-T Author Credentials

This content is prepared by professionals with extensive experience in geosynthetics engineering, containment system design, and infrastructure project support, serving EPC contractors, consultants, and international procurement teams.