Geomembranes are key materials in projects that require waterproofing and leaking control. Thanks to its endurance and durability, they are utilized in sectors such as mining, water treatment and construction. In this blog, we will explore concepts of what they are, the different types that exist and how they are used in different industries.
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A geomembrane is a synthetic barrier that, like we mentioned, is designed specially to prevent substance and material passing, usually liquids and vapors, out of the barrier that it creates. When geomembranes are made, thermoplastic or thermostable polymeters are used. They have the particularity of presenting a high permeability level, offering an excellent option for contention, if compared with different materials.
The different kind of geomembranes that exist, can be classified by its structure (homogeneous or reinforced), its finish (smooth or textured) or by its main component. The last category is the most commonly used to distinguish them, since they are more or less adequate for determined applications, depending on their composition.
They are characterized by their durability, low cost, and for having a broad chemical resistance. They also offer greater coverage due to the size of the rolls in which they are manufactured, and they offer an excellent control over the installation's quality.
The most commonly used geomembrane from this category, is the high density polyethylene (HDPE) geomembrane. This is manufactured with virgin polyethylene resin, which makes it very flexible, besides polyethylene, it contains charcoal, heath stabilizers and antioxidants, compounds that provide an optimal chemical resistance, excellent impermeability, and great resistance to cracking and UV rays.
This type of geomembranes is obtained by polymerizing vinyl chloride, which is manufactured from chlorine and ethylene. Their formula includes materials as plasticizers, antioxidants, fillers, and polymer resin in different proportions, and depending on these, their physical, mechanical, chemical and thermic properties vary.
PVC ones are geomembrane that are low-cost and usually are highly weather resistant, lightweight and recyclable. Their main advantage is that, depending on the conditions of the site where they will be installed, special formulas can be used to accomplish required parameters. Furthermore, if high-frequency sealing is used during installation, large panels can be created.
They are produced with ethyl propylene and semicrystalline polypropylene and do not use plasticizers in their formulation. These geomembranes have the lowest density, making them easier to deploy in panels. They also have the lowest water transmission rate compared to other typer of geomembranes, making them one of the best options available for waterproofing.
These geomembranes are highly resistant to weathering and UV exposure, they have an excellent dimensional stability, and allow for high quality control during the installation.
These are vulcanized rubber sheets that include lampblack, vulcanizing agents, and oils, among some other components in their formulation. Their molecules are structurally linked, making them elastic and chemically stable, allowing them to withstand deformation in a better way, compared to other kinds of geomembranes.
EPD and EPDM-R geomembrane are resistant to weathering, ozone, and UV radiation, they adapt perfectly to extreme temperatures, are highly flexible, and are quick and easy to install, thanks to the self-adhesive strips from the panel joints.
These geomembranes can stand degrading attacks, UV rays, and oxygen, they are dimensionally stable, weather-resistant, and resistant to a large range of chemicals. One unique feature of this type of membrane is that they retain their flexibility even under freezing conditions.
Each type of geomembrane that we have described has specific applications, so it is recommended to consult with a specialist with extensive experience in the theme, to receive coaching on selecting the most appropriate geomembrane for your project.
At SAI, we stand out as leaders in the installation of thermoplastic geomembranes, pipes, and thermoplastic accessories. We are committed to promoting the sustainable use of natural resources, that's why it will be a pleasure to provide you with the advice you need to choose the geomembrane that best suits your project's applications, technical requirements, and budget. Contact us, we will be happy to offer you a cost-effective and sustainable solution for your projects.