LDPE Geomembrane

What is an LDPE geomembrane?

An LDPE geomembrane is a flexible low density polyethylene liner used as an impermeable barrier in environmental and water works. SIGMA produces the LDPE liner from high-quality polyethylene resin with proportional carbon black, antioxidant, anti-ageing and UV-resistance materials, so the membrane is impermeable and ultraviolet-resistant. Like other smooth geomembranes, the LDPE liner is more cost-effective, safer and faster to deploy than traditional concrete and compacted clay.

Why buyers choose this LDPE liner

The LDPE liner combines good physical and mechanical performance with high tear resistance and strong deformation adaptability, so it conforms to irregular subgrades without failing. It resists corrosion and ageing, adapts to high and low temperature, is non-toxic, and delivers good waterproof, drainage, anti-seepage and damp-proof effects — all with a complete range of widths and thicknesses, low cost and easy installation. It is widely used for solid waste landfills, waste containment, aquaculture and water treatment systems.

LDPE vs LLDPE and HDPE

LDPE, LLDPE and HDPE are all polyethylene geomembranes but differ in density and stiffness. For projects needing the flexibility and high elongation of a GRI-GM17 grade, see our LLDPE geomembrane; for the stiffness, density and stress-crack performance of a GRI-GM13 grade, see our HDPE geomembrane. Browse the full geomembrane range to match the right polyethylene liner to your project.

How the LDPE film liner is made

SIGMA produces the LDPE film liner from high-quality low density polyethylene resin blended with proportional carbon black, antioxidant, anti-ageing and UV-resistance additives, then extruded into a uniform impermeable sheet. The carbon black and stabilizer package is what makes the membrane ultraviolet-resistant and gives it a long service life outdoors. Because the resin is non-toxic, the same LDPE liner used for waste containment is safe for aquaculture and water storage.

Installation and seaming

The LDPE geomembrane is laid over a prepared, compacted subgrade and joined by hot-wedge welding, with extrusion welding around details and penetrations; seams can be air-pressure or vacuum tested. Thanks to its low density and flexibility the LDPE liner conforms readily to slopes, corners and irregular ground, and its low cost and easy installation make it fast to deploy. The perimeter is secured in an anchor trench, and tighter shapes such as a cone or hopper base can be fabricated as an ldpe cone liner on request.

Standards, quality and service

No single public statutory standard (ASTM, GRI or GB) governs finished LDPE geomembrane as a class — GRI-GM17 covers LLDPE and GRI-GM13 covers HDPE — so the LDPE liner is supplied to a manufacturer specification, with each property tested to its own ASTM method. We offer a complete range of widths and thicknesses and confirm the exact grade and tested values against your order. Tell us the application, required thickness and area and we will confirm availability and ship from our factory.