Disclaimer: These answers are provided for informational purposes only and are not intended as a warranty or guarantee. EnviroCon Systems, Incorporated assumes no responsibility in connection with the use of this information.
What is the life expectancy of HDPE liners?
The life expectancy of HDPE liners 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 liners. 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.
Are EnviroCon installed liners resistant to chemical attack? Which chemicals?
Chemical resistance in liners is referred to as “chemical compatibility”. This term in its strictest sense is used when a chemical has no effect on the geomembrane material. However, from a practical application and engineering perspective, chemical compatibility means that a liner will not fail due to chemical exposure although the chemical may have some effect on the liner material. Each liner recommended and supplied by EnviroCon provides a high degree of chemical resistance to a wide range of chemicals. A chemical compatibility list can be provided upon request.
Can liners be exposed to sunlight for an extended period of time?
Yes, if they have been treated with a UV inhibitor, such as carbon black added to polyethylene liners. EnviroCon will provide material that is equipped to meet the requirements of every project.
Can I purchase the liner and install it myself, or do I have to go through an installer?
You can purchase and install the liner yourself. However, liner installation is a specialized skill and the manufacturer’s warranty is voided if the liner is not installed by a certified installer. Thus you run the risk of additional costs should the liner need to be repaired or replaced. EnviroCon field technicians are vigorously trained and our work does meet the requirements for manufacturer warranties.
In what applications are liners most frequently used?
Geosynthetic liners are suited for a wide range of applications. The most common uses are in pits, ponds, wastewater treatment, tanks, basins, sumps, foundations, landfills, canals, secondary containment walls or berms, water reservoirs, lagoons, leach / processing pads, and leak detection and collection.
Are there any limits on a project size?
No. EnviroCon has completed projects ranging from a few hundred square feet to millions of square feet of liner.
What is the temperature range for HDPE liners?
160º F through -40º F
Are liners immune to root penetration?
Liners are resistant to root penetration. However some vegetation, such as nut grass, could penetrate a liner in thicknesses less that 12 mil. EnviroCon recommends that the subgrade soils be prepared and free of roots and other organic material to mitigate such problems.
Why does HDPE wrinkle?
Thermal expansion and contraction of approximately 2% over 10º variance in temperature will cause the liner to move. This movement is normal and EnviroCon design engineers allow for it as appropriate in each application.
Does material thickness influence puncture resistance?
Yes and no. Various geosynthetic materials have different levels of flexibility and puncture resistance. For example, to have the same degree of puncture resistance would require a thicker polyethylene material than EPDM or PVC because the puncture resistance and flexibility of EPDM and PVC are higher. EnviroCon will ensure the liner used is appropriate and will meet all requirements in each application.
How is the thickness of a liner determined for a specific application?
Liner thickness is determined through regulations and specifications established by the Environmental Protection Agency (EPA) and state government environmental agencies. EnviroCon design engineers have extensive working knowledge of such regulations and will ensure that all materials used meet or exceed all specifications and requirements.