High Density Polyethylene (HDPE)
HDPE is an excellent lining material, and is the most widely used. HDPE has high tensile strength along with good chemical resistance and offers very reliable containment. The life expectancy of an HDPE liner is dependent upon the environment in which it is installed. Exposure to high temperatures, certain chemicals, constant loads and adverse site conditions shorten the life of the liner. In buried applications such as a solid waste landfill, the life expectancy can be up to 200 years. In an exposed application such as a floating cover, the life expectancy can reach 20 years. HDPE requires highly specialized installation. EnviroCon has over ten years of experience designing and installing HDPE liners in a variety of applications. Our field technicians are properly trained in the required installation techniques and we have a proven track record of successful installations.
Linear Low Density Polyethylene (LLDPE)
LLDPE has a very high degree of flexibility and puncture resistance. LLDPE elongates under stress and has good resistance to the stresses of chemicals and ultraviolet light. It is the most appropriate lining material for projects which require significant material flexibility due to its ability to conform to any shape.
Polyvinyl Chloride (PVC)
PVC offers good flexibility, high puncture and abrasion resistance, and waterproofing qualities. PVC liners prevent contaminants from passing into groundwater or streams and can be used to prevent seepage in potable water storage. PVC is adversely affected by exposure to ultraviolet light and therefore should be used only in covered applications. When used in buried applications, PVC liners can have a life expectancy up to 20 years.
Hypalon chlorosulfonated polyethylene liners are resistant to damage caused by high temperatures, exposure to severe weather and ultraviolet light, and oxidizing chemicals. EnviroCon recommends Hypalon in exposed liners and for floating covers for water and sewage containment.
EPDM retains its flexibility in temperatures ranging from -40º F to 175ºF, which allows for year-round installation. EPDM has excellent UV resistance and does not degrade due to exposure to sunlight. The flexibility of EPDM allows it to conform to any shape as well as undulations in the subgrade.
Geotextiles are suitable for use in drainage projects and as reinforcement to other geosynthetic lining materials. When utilized in drainage and filtration applications, the geotextile material needs to pass water while concurrently filtering out soil particles. When used with a geosynthetic liner, geotextiles can protect the liner from damage due to rocks or other debris.
Geosynthetic Clay Liners (GCL)
Geosynthetic Clay Liners are made of a composite of durable geotextile outer layers around a core of sodium bentonite clay. Sodium bentonite clay is a naturally occurring clay mineral that swells when exposed to water. When used in combination with the GCL, the clay can provide the same protection as several feet of compacted clay at less cost and labor. GCLs can be formulated to withstand exposure to various chemicals.
Drainage composites consist of a geotextile laminated to one or both sides of a Geonet material. Drainage composites are designed to provide protection for waterproofing systems and to collect excess water on horizontal surfaces such as building foundations and slabs. These drainage systems replace the conventional sand or gravel covered pipe drain. Drainage composites are designed to provide planar flow of liquids and protection from clogging due to soil or sand particles.
Geonet is a drainage composite made of extruded three-dimensional HDPE. Geonet allows for high flow drainage of liquids or gasses both horizontally and vertically. Geonet drainage composites have a non-woven filter fabric bonded to the ridges. This filter fabric stops the flow of particles, while allowing the filtered liquid to pass to the drainage core. The HDPE used in Geonet is flexible, yet exceedingly strong. This makes it ideal for use in projects that require heavy loads or vehicular traffic.