HDPE Geomembrane
Product Introduction
HDPE (High-Density Polyethylene) Waterproof Geomembrane is a low-permeability synthetic membrane liner or barrier used with any geotechnical engineering related material so as to control fluid (or gas) migration in a human-made project, structure, or system.
It is the most widely used geomembrane in the world due to its exceptional chemical resistance and durability.
1. Key Characteristics
HDPE geomembranes are favored for large-scale projects because of their specific physical properties:
Chemical Resistance: It is highly resistant to a wide range of chemicals, including acids, alkalis, and salts, making it ideal for hazardous waste containment.
UV Resistance: High-quality HDPE contains carbon black, providing excellent protection against ultraviolet radiation for long-term exposed applications.
Low Permeability: It has an extremely low water vapor transmission rate, making it an effective barrier against water and gases (like methane).
High Tensile Strength: It can withstand significant stress and elongation, allowing it to adapt to ground settlement.
Working Principle
Technical Specifications
HDPE geomembranes are typically classified by their thickness, measured in millimeters (mm) or mils (1/1000 of an inch):
0.5mm - 0.75mm: Light duty (small ponds, temporary covers).
1.0mm - 1.5mm: Standard duty (most aquaculture and irrigation projects).
2.0mm - 3.0mm: Heavy duty (hazardous waste landfills, mining operations).
Installation & Welding (The Critical Phase)
The performance of a geomembrane depends 100% on the quality of the seams. There are two main welding methods:
Dual-Track Hot Wedge Welding: This is used for long straight seams. It creates two parallel welds with an air channel in between, allowing for easy pressure testing to ensure there are no leaks.
Extrusion Welding: Used for repairs, patches, and detailed work (like pipe penetrations). It uses an extrusion gun to melt a bead of HDPE over the seam.
Complementary Materials
In most engineering designs, the HDPE geomembrane is not used alone. It is part of a Composite Liner System:
Geotextile: Placed above or below the membrane to protect it from puncture by sharp stones.
Geonet / Geocomposite: Placed on top to facilitate drainage of liquids or gases.
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Application Case
Application
Primary Applications
HDPE geomembranes are the "gold standard" for environmental protection and liquid storage:
Landfills: Used as the primary bottom liner to prevent leachate from contaminating groundwater and as a final cover to prevent rainwater entry.
Aquaculture (Fish & Shrimp Ponds): Provides a clean, waterproof lining that prevents soil erosion and maintains water quality.
Water Conservancy: Used in canal lining, reservoir waterproofing, and artificial lake beds to prevent seepage.
Mining (Heap Leach Pads): Used to prevent precious metal-bearing solutions from leaking into the soil during the leaching process.
Oil & Gas: Secondary containment for oil tanks and gas stations to prevent soil pollution in case of spills.
Address
Production Center: Development Zone, Tai'an City, Shandong, China
Marketing Center: Ichi-no-Machihigashi, Sakai-ku, Sakai City, Osaka, Japan