10/11/2025
A geomembrane is a synthetic, impermeable sheet used as a liner or barrier to control the migration of liquids and gases in man-made projects like landfills, ponds, and canals. Made from polymeric materials such as high-density polyethylene (HDPE) or polyvinyl chloride (PVC), they are durable, flexible, and resistant to chemicals and UV degradation.
What it is and what it's made of
Definition: A geomembrane is a low-permeability synthetic liner designed to form a fluid-tight barrier in projects involving geotechnical materials.
Common materials: They are most commonly made from high-density polyethylene (HDPE), but other materials include linear low-density polyethylene (LLDPE), polyvinyl chloride (PVC), and ethylene propylene diene monomer (EPDM).
How it's used: They can be used as a single layer or in a "geocomposite" when combined with other geosynthetic materials like geotextiles.
Applications
Environmental protection: Lining landfills, waste lagoons, and for secondary containment to prevent leakage of hazardous liquids into the soil.
Water containment: Used for irrigation ponds, canals, reservoirs, and aquaculture ponds.
Mining: Used in heap leach and tailing ponds to contain liquids.
Civil engineering: Incorporated into dams and hydraulic structures to control leakage.
Key features and benefits
Impermeable: Provides a watertight barrier to prevent fluid migration.
Durable: Resists chemical substances, microorganisms, and UV light, with a long service life of 50 years or more under good conditions.
Economical: Offers a cost-effective alternative to concrete for many containment and waterproofing projects.
Flexible: Can adapt to different site conditions and is resistant to tearing and punctures.