Overview
The 400g composite geomembrane is a laminated geosynthetic material combining a non-woven geotextile with an impermeable geomembrane layer. The '400g' designation indicates its weight per square meter, reflecting its medium-duty classification suitable for most civil engineering applications. Developed to address limitations of single-layer geomembranes, this composite structure leverages the geotextile's drainage/filtration capabilities and the geomembrane's fluid barrier properties. It meets international standards like ASTM and GRI-GM13 for engineered containment systems.
Structure and Working Principle
The product typically consists of a 100-150g/m² needle-punched geotextile thermally bonded to a 0.2-0.5mm HDPE geomembrane. The textile layer distributes stress loads and protects the membrane from punctures, while the polymer film provides a hydraulic barrier with permeability coefficients <10-12 cm/s. During installation, overlapping seams are heat-welded to form continuous impermeable surfaces. The composite action enables it to withstand differential settlement while maintaining barrier integrity—critical for long-term projects like landfill caps or reservoir liners.
Key Features
Mechanical strength is a standout feature, with typical tensile strength exceeding 20kN/m in both machine and cross directions. The 400g variant balances cost and performance, offering adequate puncture resistance (500N ASTM D4833) for most subgrade conditions. UV-stabilized formulations extend service life to 20+ years in exposed applications. Chemical compatibility covers pH 2-12, making it suitable for containing leachates or industrial effluents. Some variants include anti-root additives for agricultural use.
Application Areas
Primary applications include municipal solid waste landfills (base liners and caps), where it prevents leachate migration. In water management, it lines irrigation canals, tailings ponds, and aquaculture tanks with 100% seepage control. Transportation projects utilize it for subgrade separation in railways/highways built on soft soils. Environmental remediation projects deploy it as vapor barriers for contaminated sites. Secondary uses include temporary covers for construction sites and secondary containment for industrial facilities.
Maintenance and Precautions
Pre-installation requires proper subgrade preparation—removing sharp protrusions and compacting soil to 90% Proctor density. Post-installation inspections should verify seam integrity via vacuum or spark testing methods. For exposed installations, minimize UV exposure duration before backfilling. Avoid hydrocarbon contact which can degrade HDPE. Regular inspections should check for surface depressions indicating subgrade erosion—a common failure mode requiring localized repairs with compatible patching materials.
B2B Procurement Guide
Specify performance parameters: tensile strength (MD/CD), CBR puncture resistance, and peel bond strength between layers (≥6N/mm per GRI-GM13). Require third-party test reports from SGS or similar agencies. Bulk orders (10,000m²+) often qualify for 8-15% discounts. Lead times average 15-30 days for custom widths (2-8m rolls). Preferred suppliers should have project references in your industry segment—landfill contractors prioritize different properties than aquaculture developers. Consider FOB pricing from manufacturers vs. stocked distributor pricing.
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