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What is Geomembrane?

What is a Geomembrane liner?

Geomembrane is a plastic construction material product, which is waterproof, impermeable, used for seepage control projects to have an impermeable containment or barrier.

Geomembrane is one kind of geosynthetic product, with excellent geomembrane properties and competitive price advantage. It is used in many industries, water management, oil gas, environment, aquaculture, agriculture.

Earthshield geomembrane is made of polyethylene resin at the special formula, our products include HDPE geomembrane, LLDPE geomembrane, smooth geomembrane, and textured geomembrane, all the products use 100% virgin material, no recycled secondary material.

HDPE Geomembrane
Geomembrane liner

What are the Geomembrane Types?

There are different kinds of geomembrane, for example, HDPE geomembrane, LLDPE geomembrane, EPDM geomembrane, PVC geomembrane, and so on. The different geomembrane has different features, and the applications are different too.

1. HDPE Geomembrane

HDPE geomembrane is High-density polyethylene, it is the most used geomembrane liner in the world, because of its long service life, strong technical property, and competitive price. It is used for landfills, mining, water covers, and canal liners. The low cost and high chemical resistance make it more popular.

HDPE Geomembrane

2. LLDPE Geomembrane

LLDPE geomembrane is a Linear low-density polyethylene geomembrane, it is more flexible than HDPE geomembrane, easy to install. The property lets its low temperature and UV resistance. It can be used for water tanks, landfill cover, and aquaculture containments.

lldpe-geomembrane
LLDPE Geomembrane

3. PVC Geomembrane

PVC geomembrane is a Polyvinyl chloride geomembrane, it is made of vinyl, plasticizers, and stabilizers.PVC geomembrane is flexible and can be used for landfills, tanks, lagoon projects, but not good for aquaculture fish shrimp ponds.

4. EPDM Geomembrane

EPDM geomembrane is Ethylene propylene diene monomer geomembrane, it is a flexible and durable material, rubber material with good UV resistance.it is used for dam, agriculture, irrigation projects. but it is too heavy.

Earthshield is a manufacturer of PE geomembrane, HDPE geomembrane, and LLDPE geomembrane, using 100% high-quality virgin polyethylene raw material to make geomembrane. the main component of geomembrane liner is 97.5% polyethylene resin,2.5% carbon black. our company uses an international advanced multiple-layer co-extrusion blowing film process, the production process follows the ISO9001 quality control system, and the finished geomembrane has excellent properties, especially chemical resistant, UV resistant, stress teat resistant, and tensile strength. The property meets the ASTM standard and passed the SGS TRI third-party lab test.

What are the Geomembrane Properties?

Physical properties: the main items are thickness(smooth, textured), density, Melt flow index,

Mechanical properties: there are many items to determine the strength of geomembrane, like, tensile strength and elongation, tear resistance, impact resistance, CBR, UV resistance, stress cracking.

According to the ASTM GM Standard, Earthshield HDPE geomembrane meets GM13, and LLDPE geomembrane meets the GM17 standard, property requirement has the third party lab test report.

Click to Get the Specifications of Geomembrane

What are the Applications of a Geomembrane?

With the high property and suitable price, the geomembrane application is more and more, such as agriculture, fish pond, water dam, landfill, mining, etc.

Agriculture: lagoons, irrigation ponds, canals, there are other applications as follows:

Aquaculture, fish shrimp ponds

Greenhouse covers

Potable water ponds

Koi ponds

Waterscape and architectural ponds

Landfill: The landfill projects need a high technical property geomembrane to protect the groundwater and soil is contaminated. the Earthshield HDPE geomembrane is chemical resistant, so the hazardous waste landfill, sanitary landfill all use our geomembrane.

Mining: Our HDPE geomembrane liner helps the mining heap leach process, low-cost budget, and protects the environment.

River dams: River dam projects include many applications:

Brine ponds

Algae ponds

Cofferdams

Golf course pond

Lakes

Evaporation ponds for salt recovery

Containment

Secondary containment can prevent the waste from polluting soil and water.

Oil gas field containment

Mining containment

Drilling site pad liners

Heap leach pads

Disposal of mill tailings from mining operations

Lagoons and pits

Lagoons and pit liner is used to control wastewater seepage, for example

Animal waste containment

Biogas collection covers

Oil gas pits

What is the Geomembrane Manufacturing Process?

Earthshield uses the blown film process to produce the geomembrane liner. The blown film process follow the ISO9001 quality control system:

Polyethylene resin and carbon black resin are in different hoppers, then they are mixed from the raw material tanks at a designed percentage, then feed to an extruder barrel.

The resin is heated by an electrical heating rod outside of the barrel. It is conveyed by the rotation of a designed screw. The molten stream is forced through a filter net, which to keep purities.

The geomembrane extrudes from the circular die as a bubble, pulled by a set of nip rollers located at the top of a cooling tower. The wind ring provides the cool wind to cool the geomembrane liner temperature and ensure the bubble diameter.

the bubble goes through a collapsing frame and the geomembrane is directed back toward the ground, Before being packed by the winder, the geomembrane bubble will be cut into the designed width.

Manufacturing process quality control

Following the ISO9001 quality control, from the raw material, we will do the inspection, although our raw materials are from world-famous international factories, the resin will be inspected and tested, the material could be used when the test is passed, otherwise, the resin is rejected.

When the production starts, the resin will be in the material tank, which is 100% clean to keep the purity. When the geomembrane bubble is made, the online thickness test equipment will do an inspection, if there is a hole, the production line will stop and have changed. After the bubble cut, the width will be rechecked, and then do the packing.

Each batch has a samples test, based on the ASTM GM13 standard, especially the thickness, tensile strength, elongation, tear resistance, and CBR. The factory report then can be made when all the test is passed.

Geomembrane Thickness?

0.3mm12mils300microns
0.5mm20mils500microns
0.75mm30mils750microns
1mm40mils1000microns
1.5mm60mils1500microns
2mm80mils2000microns
Geomembrane Thickness

The geomembrane thickness range is 0.3mm to 3mm, the thickness can be customized according to customer project design.

Here are popular thickness liners for reference:0.5mm 0.75mm 1mm 1.5mm and 2mm geomembrane.

The 0.5mm/0.75mm/1mm thickness geomembrane is popular for the fish pond shrimp pond, water reservoir, irrigation, dam projects.

1mm geomembrane is also popular for landfill capping.

1.5mm/2mm thickness geomembrane is popular for landfill, water treatment, oil gas, and mining projects.

How much does the Geomembrane Liner Cost?

Geomembrane liner cost or geomembrane price is according to the geomembrane raw material, geomembrane thickness, geomembrane quantity, geomembrane width, packing can also affect the geomembrane liner cost.

Another important factor is transportation, if the project site is far, it will have more cost.

The last factor is the installation and project site conditions. the project site condition can add the cost of transportation, and geomembrane liner properties like weight, flexibility, and durability affect the installation cost. The HDPE geomembrane liner weight is not heavy, much flexible, easy to operate, so the total cost is much cheaper.

Some people do not care about the quality control cost for installation, and the normal inspection and maintenance cost is not paid attention to. In different projects sites, the maintenance cost increases too much. For example, the temperature can affect the service life of the geomembrane liner. once the project has failures, the cost will be much huge.

What is the difference between Geotextile and Geomembrane?

  1. Water Permeability:

The geomembrane is impermeable to water, but geotextile materials are water-permeable.

2. Material Composition:

Geomembrane is a kind of waterproof barrier material based on high polymer, Polyethylene material.

Geotextiles, also known as geotextiles, are permeable geosynthetic materials made of synthetic fibers that are needled or woven. material is polyester/PET or polypropylene/PP. In simple terms, geomembranes are impermeable and geotextiles are permeable.

3. Functional Features:

Geomembrane: small specific gravity, strong elongation, high deformation ability, corrosion resistance, low-temperature resistance, good frost resistance.

Geotextile: high strength, corrosion resistance, good water permeability, good resistance to microorganisms, filtration and reverse filtration, slope protection, at the same time, combined with geomembrane as a composite waterproof and impermeable material, can play a role in puncture prevention

4. Main Applications:

According to the impermeable characteristics of geomembrane, it can meet the impermeable requirements of railway, highway, sports hall, dam, hydraulic construction, tunnel, landfill, biogas pool, and biogas pool, environmental protection, and other projects.

Combined with the permeability and filtration characteristics of geotextile, it is used in highways (including temporary roads), railways, embankments, earth and rock dam, airport, sports field, and other projects to strengthen the weak foundation.

And according to the needs of different projects, geomembrane and geotextile are combined. Geomembrane serves as the protective layer, cushion layer, drainage, and exhaust layer, and reinforcement layer of geomembrane, and geomembrane serves as the impermeable main body.

What is the Surface of the Geomembrane?

Earthshield geomembrane could make double sides smooth, one side smooth and one side textured, double sides textured surface.

The textured surface is rough, it can add the friction between geomembrane liner and other products, like nonwoven geotextile. Because the textured surface geomembrane is not flat, the friction is high, the geomembrane liner cannot slip at the slop, and the workers can stand there, it is antislip and stable.

The textured surface geomembrane is made of polyethylene material, first step is to make the smooth geomembrane liner, the basic smooth geomembrane can have a good property, the second step is to make the textured surface geomembrane, the polyethylene raw material is melted and sprayed on the smooth geomembrane liner. The textured geomembrane liner can be produced 8m width and has a blank area at each side,20cm smooth area, which can be used to weld the geomembrane liners together.

What is the Color of the Geomembrane?

The normal color of geomembrane is black color because the geomembrane has carbon black raw material. The carbon black material adds the UV resistance of the geomembrane and can have a longer life when exposed to sunshine.

If the geomembrane does not have carbon black material, the color is transparent, so other special colors can be done, for example, blue color, white color, green color, red color.

The color can be done at both sides, like double sides black color. Earthshield can also make one side black color, and another side white color, red color, a green color, or other colors.

What is the size of the Geomembrane?

Earthshield can make 1m to 8m geomembrane liner, and the popular with of the geomembrane is 5.8m, 7m, and 8m.

5.8m geomembrane width is popular because it can be loaded in a 20feet container, and the rolls are easy to do construction, especially for small projects, like a fish pond, shrimp pond, water reservoir, one or two people can handle the rolls.

7m geomembrane or 8m geomembrane are popular because this width can reduce the welding area of the geomembrane liner, especially for landfill, mining, water treatment projects. The 7m or 8m width geomembrane can have less welding overlap area, reduce the risk of a leak, and reduce the installation cost of people.

The geomembrane length is no problem, 50m 100m 140m 200m, the length can be customized according to the project design and considering the loading ability in the container. If the length is too big, the container loading quantity is less, so the average cost is much higher.

What is the third-party test of Geomembrane?

With many years of geomembrane production experience, our geomembrane meets the ASTM GM Standard, and our customers test the geomembrane in SGS, TRI, ACSIG third-party labs, all the test reports show our quality is excellent, the property is higher than TRI GM standard.

Earthshield also does the inspection at the national construction lab, and the test result is very good too.

How long does the HDPE Liner Last?

The lifetime of geomembrane liner is an important question, but the answer is not easy and fast to get, based on whether the geomembrane is covered. The geomembrane is made of polyethylene raw material and carbon black master material. if the formulation is changed, the property is different, and the lifetime may be different.

What items affect the lifetime of Geomembrane?

The answer is Ultraviolet, Oxidation, ozone, chemical, Biological, temperature, and so on. In the ASTM GRI documents, there is a test about the lifetime of geomembrane, with two different conditions, a lifetime of covered geomembrane liner, and a lifetime of exposed geomembrane. for the covered geomembrane in landfill projects, life is predicted from 446years at 20℃, to 69years at 40℃. The Exposed geomembrane lifetime is not very clear, because the condition is not the same all the time. But in the lab test, the exposed geomembrane lifetime is predicted to be 36years and the test is ongoing.

If your project condition is harsh, for example, landfill, wastewater treatment, mining tailing projects, the project can have a longer life with the ASTM standard geomembrane liner.

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