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Geomembranes are an essential material used in various applications across industries, including mining, water management, waste collection, and agriculture. These synthetic sheets provide an impermeable barrier that prevents the leakage of liquids and gases, thereby ensuring environmental and human health safety.

However, not all HDPE/LDPE geomembrane liners are of the same quality, and choosing the right geomembrane for your specific application is crucial. There are ten parameters to consider when selecting a high-quality geomembrane, including

  1. Material Quality
  2. Tensile Strength
  3. Seam Strength
  4. Elongation
  5. Tear Resistance
  6. Puncture Resistance
  7. Chemical Resistance
  8. UV Resistance
  9. Permeability
  10. Welding Capacity

This article will provide a detailed explanation of each parameter to help you make informed decisions when selecting a geomembrane.

Top 10 Parameters

Material Quality

The quality of the raw materials used in the manufacture of a geomembrane is critical in determining its durability, strength, and resistance to chemicals, punctures, and tears. High-Density Polyethylene (HDPE) and Low-Density Polyethylene (LDPE) are the two most commonly used materials to make geomembranes. HDPE is known for its superior strength, stiffness, and durability, while LDPE is more flexible and offers better resistance to UV and temperature changes.

Thickness

Typically measured in millimetres (mm) or mils. It represents the thickness of the geomembrane. For example, 1.5 mm or 60 mils. Thickness directly affects the durability and impermeability of the geomembrane.

Tensile Strength

Measured in megapascals (MPa) or pounds per square inch (psi), it indicates the maximum stress the geomembrane can withstand when stretched. This parameter reflects the tensile performance of the geomembrane.

 A quality geomembrane must have sufficient tensile strength to withstand installation loads.

Elongation

Expressed as a percentage (%), it refers to the extent the geomembrane can stretch before breaking. Geomembranes with higher elongation rates are more flexible and can adapt to ground deformations.

Tear Resistance

Typically measured in newtons (N) or pound-force (lbf), it indicates the maximum force the geomembrane can withstand when torn. This parameter reflects the tear resistance of the geomembrane.

Puncture Resistance

Measured in newtons (N) or pound-force (lbf), it indicates the maximum force the geomembrane can withstand when punctured by a sharp object. This parameter reflects the puncture resistance of the geomembrane.

Chemical resistance

It indicates the geomembrane’s ability to withstand different chemicals. Good chemical resistance ensures the long-term performance of the geomembrane in various environments.

UV Resistance

It refers to the geomembrane’s resistance to aging under UV exposure. Higher UV resistance means the geomembrane can maintain a longer service life when exposed to sunlight.

Permeability

Expressed in centimeters per second (cm/s), it reflects the impermeability of the geomembrane. The lower the permeability, the better the impermeability.

Welding Capacity

The ability to weld geomembrane sheets together is critical to creating a leak-resistant, seamless, and continuous barrier. A quality geomembrane must have excellent welding properties to enable easy and reliable installation.

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