Rough Geomembrane

Product Definition

Rough Geomembrane is a textured polymeric impermeable liner engineered to enhance interface friction between lining systems and adjacent soils or geosynthetics, widely used in slope lining, landfill containment, and hydraulic engineering where stability and anti-sliding performance are critical.

Technical Parameters and Specifications

• Material type: HDPE / LLDPE

• Surface type: Single-sided rough / Double-sided rough

• Nominal thickness: 0.75 mm – 3.0 mm

• Sheet width: 5.8 m – 8.0 m

• Sheet length: 50 m – 200 m (customizable)

• Density (HDPE): ≥0.94 g/cm³

• Textured asperity height: 0.25 – 0.50 mm

• Interface friction angle: 22° – 34° (material dependent)

• Tensile strength at yield: ≥15 MPa

• Elongation at break: ≥700%

• Carbon black content: 2.0% – 3.0%

• Service life (buried): ≥50 years

Structure and Material Composition

• Base Polymer Layer: High-density or linear low-density polyethylene providing impermeability

• Textured Surface Layer: Engineered roughness formed during extrusion or embossing

• Carbon Black Additives: UV resistance and long-term durability

• Stabilizers and Antioxidants: Protection against thermal and oxidative aging

• Optional Reinforcement Interface: Designed to work with geotextiles or drainage layers

Manufacturing Process

1. Raw Material Preparation: Polymer resin blending with carbon black and stabilizers

2. Flat Die or Blown Film Extrusion: Formation of continuous geomembrane sheet

3. Texturing Process: Inline embossing or nitrogen gas injection to create rough surface

4. Thickness and Surface Control: Laser or sensor-based real-time monitoring

5. Cooling and Annealing: Dimensional stability enhancement

6. Quality Inspection: Mechanical testing, friction angle verification, visual checks

7. Rolling and Packaging: Protective wrapping for transportation and storage

Industry Comparison

Application Scenarios

• Landfill base liners and steep side slopes

• Heap leach pads in mining projects

• Reservoirs, canals, and water containment slopes

• Tailings dams and industrial waste ponds

• EPC environmental protection projects

Core Pain Points and Solutions

• Slope liner slippage: Rough Geomembrane increases frictional resistance

• Interface instability under load: Textured surface improves shear strength

• Complex anchoring design: Reduced need for excessive anchoring systems

• Long-term safety concerns: Durable polymers ensure stable performance over decades

Risk Warnings and Mitigation Measures

• Incorrect friction angle assumptions may cause design errors; use tested values

• Surface damage during installation; enforce strict handling protocols

• Improper welding parameters; require qualified welding technicians

• Extended UV exposure before cover; minimize outdoor storage duration

Procurement and Selection Guide

1. Define slope angle and stability requirements

2. Select single-sided or double-sided roughness based on interface conditions

3. Determine appropriate thickness according to mechanical load

4. Verify friction angle test reports from accredited laboratories

5. Confirm compliance with relevant ASTM or ISO standards

6. Evaluate manufacturer production capability and project references

Engineering Case Study

In a hazardous waste landfill project with 1V:2H side slopes, a 2.0 mm double-sided Rough Geomembrane was installed over a compacted clay liner. Interface shear testing and field monitoring showed a safety factor improvement of over 35%, while maintaining long-term liner integrity under waste loading conditions.

FAQ

1. What is the main advantage of Rough Geomembrane? — Enhanced interface friction.

2. Is it suitable for steep slopes? — Yes, especially where sliding risk exists.

3. Single or double rough, how to choose? — Based on contact layers above and below.

4. Does roughness affect welding? — No, welding is performed on smooth edges.

5. What thickness is common for landfills? — Typically 1.5–2.5 mm.

6. Can it be combined with geotextile? — Yes, commonly used together.

7. How is quality verified? — Mechanical and interface shear testing.

8. What standards apply? — ASTM GRI-GM13 or equivalent.

9. Is installation equipment different from smooth liners? — No major difference.

10. What is the expected service life? — Over 50 years in buried conditions.

Call to Action

For technical datasheets, interface friction test results, project-specific recommendations, or commercial quotations for Rough Geomembrane, please submit your engineering requirements to receive a professional response.

E-E-A-T Author Credentials

This article is authored by geosynthetics engineers with over 15 years of experience in environmental containment systems, landfill engineering, and hydraulic infrastructure projects, supporting EPC contractors and material procurement teams globally.