Types of Geomembranes
Depending on the parent resin used several types of geomembranes are available. The most commonly used geomembranes are listed below.
PVC Geomembrane
Polyvinyl Chloride (PVC) geomembranes is a thermoplastic waterproofing material made with vinyl, plasticisers and stabilisers. The polyvinyl chloride resin used for PVC geomembranes is made by cracking ethylene dichloride into a vinyl chloride monomer. It is then polymerized to make PVC resin.
It is tear, puncture and abrasion resistant meaning the material is perfect for preventing contaminants from entering water sources and maintaining potable drinking water. PVC geomembranes are highly flexible and are best suited for landfills and canals, tank linings, soil remediation and wastewater lagoon liners.
HDPE Geomembrane
HDPE (High-Density Polyethylene) is the most widely used geomembrane and is the preferred choice for lining projects due to its durability, strong UV resistance and relatively inexpensive material cost.
HDPE geomembranes are often selected for use in exposed applications such as landfill, reservoir covers as well as pond and canal liners. This is due to the low initial material cost and its high resistance to chemicals. It is available in higher thicknesses which other geomembrane types do not offer. HDPE geomembrane is also very strong relative to its weight and can resist higher temperatures.
One of the best characteristics of this geomembrane is its chemical and UV resistance, making it suitable for large area applications where high quality installation is required. Additionally, HDPE is food safe, allowing it to be used in storage of potable water.
LLDPE Geomembrane
Linear Low-Density Polyethylene (LLDPE) geomembranes provide more flexibility compared to HDPE, making it more appropriate for installers who require an impermeable geomembrane. It is made with virgin polyethylene resins, making it resistant to low temperature and ultraviolet exposure.
LLDPE geomembranes are also meant for long term use and will remain strong and durable for years. Its best use relates to industrial applications, such as liquid storage tanks, environmental and animal waste containments.
EPDM Geomembrane
Ethylene Propylene Diene Monomer (EPDM) geomembrane is a flexible and durable material that can resist punctures and extreme weather conditions. It has a rubber-like texture and is UV-stable with great strength.
EPDM geomembranes are typically used as surface barriers for dams and other irrigation sites. It’s also easy to install, which is why backyard landscapers use this type of geomembrane. It’s suitable for agricultural applications such as irrigation ponds as well as liners and covers.
RPP Geomembrane
Reinforced Polypropylene (RPP) geomembranes are polyester reinforced liners for long term water containment and industrial waste applications. It’s made from a UV-stabilized polypropylene copolymer that gives the material flexibility, stability and chemical resistance.
RPP geomembranes are perfect for applications where folds appear due to uneven and inconsistent weather conditions. It is supported with nylon scrim to ensure it remains strong and durable. This geomembrane type is typically used in municipal applications, aqua and horticulture, evaporation pond liners and mine tailings.
TRP Geomembrane
Reinforced Polyethylene (TRP) geomembranes are almost the same as the RPP, but use polyethylene fabric instead of polyester. This is an ideal option for lining your temporary retaining ponds.
TRP geomembranes are also a durable solution for soil remediation. Its physical properties include chemical resistance, low temperature range and ultraviolet stability. This type of geomembrane is used for canals, industrial tarps, landfills, agricultural and municipal applications.