Geosynthetic Clay Liner(GCL) is a new type of geosynthetic waterproof material. It is an environmentally friendly ecological composite impermeable material made of a layer of clay or other low-permeability mineral materials covered with nonwoven geotextile or geomembrane by needle punching or stitching.

Geosynthetic clay liner ram materials are natural inorganic material, will not undergo aging reaction, has good durability, is non-toxic, non-corrosive, and is a green environmental protection material.

Geosynthetic Clay Liner Other Names

Other names used for GCLs since their initiation are “Bentomat Geosynthetic Clay Liner”, “Geosynthetic Liners”, “GCL Liner”, “Clay Blankets”, “Bentonite Blankets”, “Bentonite Mats”, “Prefabricated Bentonite Clay Liner” and “Clay Geosynthetic Barriers”, the latter currently favored by the International Organization for Standardization (ISO).

Geosynthetic Clay Liner Waterproof Principle

Geosynthetic Clay Liner is a commonly used blanket-like geotechnical material, which is mainly used for anti-seepage operations in artificial lakes and pools. Geosynthetic Clay Liner has a certain expansion performance, absorb enough water to make the material particles swell dense and regularly arranged, which plays a certain role in waterproof and anti-seepage. Compared with a geomembrane, its waterproof performance is weak, but it will not prevent the exchange of minerals and water between the upper and lower layers of the Geosynthetic Clay Liner, thereby maintaining the stability of the ecosystem, which is often used in artificial lakes and landscape pools. to this material.

Types Of Geosynthetic Clay Liner

Bentonite is divided into two types: nano-based and calcium-based, due to their different coefficients of water expansion, but both are composed of a material called montmorillonite. Generally speaking, the expansion coefficient of the nano-Geosynthetic Clay Liner is smaller, the use effect is worse than that of calcium base, and the anti-seepage performance is also weak. It is often used in fields with lower requirements for waterproofing. Because the Geosynthetic Clay Liner is covered and woven by the upper and lower layers of geotextiles, it becomes dense and not easy to move after being swelled by water and has a fixed function to prevent the slope from sliding.

Bentonite is highly swelling after absorbing water, and the formed gel impermeable body has strong water-stopping properties, low water conductivity performance, and won’t reduce the anti-seepage and waterproof performance under dry, wet, freeze-thaw conditions.

The Geosynthetic clay liner has a high permeability coefficient, which can repair and heal any leaking points by the migration of bentonite, and will not damage the waterproof system due to foreign matter penetration or puncture.

Geosynthetic Clay Liner Specification

GCL Physical Mechanics Performance Index



Technical Data




Tolerance of Length and Width(%)




Mass Area Ratlol(g/m2)

≥ 4000

≥ 4000


Expansion index/(mL/2g)




Blue Absorption Capacity(g/100g)




Tensile Strength/(N/100mm)




Elongation under Max load/%




Peeling Strength/(N/100mm)

Woven and Non-woven Fabric



PE and Non woven Fabric



Coefficient of Permeatbily(m/s)




Hydrostatic Resistance

0 4MPa,1h,              No leakage

0.6MPa,1h,              No leakage


Filtration Loss/mL







Geosynthetic Clay Liner Applications

Geosynthetic Clay Liner is mainly used in river courses, artificial lakes, landfills, tailings treatment, and various engineering protection and anti-seepage projects.

Geosynthetic Clay Liner Installation

The construction method of flat lap joint of Geosynthetic Clay Liner (GCL): the lap width should not be less than 200mm, sprinkle bentonite sealing powder at 75mm of the edge of the lapped bottom Geosynthetic Clay Liner (GCL), its width is 50mm, and the weight is 0.5kg/ m. In case of strong winds, the bentonite sealant should be used for sealing.

The Geosynthetic Clay Liner (GCL) should be naturally relaxed and firmly attached to the base layer, and should not be folded or suspended in the air.

When laying Geosynthetic Clay Liner (GCL) at the boundaries of the lake bottom, the Geosynthetic Clay Liner (GCL) should be well overlapped with the Geosynthetic Clay Liner (GCL) reserved for slopes or revetments, and the overlap should be properly improved for soil foundations quantity.

During the laying process, the appearance of the Geosynthetic Clay Liner (GCL) should be checked at any time for defects such as damage and holes. When defects such as damage or holes are found, they should be repaired with bentonite sealing powder (paste) in time, and a Geosynthetic Clay Liner (GCL) enlarged by more than 200mm around the damaged part is used to cover and repair locally. The edge parts shall be treated according to the requirements of lap joints.

Note: During the laying process of Geosynthetic Clay Liner (GCL), the construction of the protective layer should be carried out in time to ensure that the Geosynthetic Clay Liner (GCL) cannot be exposed to water before the construction of the subsequent process (such as a protective layer or concrete pouring).

Geosynthetic Clay Liner Price

Density, width, length, color, thickness, quantity, payment term, delivery time, purchase time

The ordinary waterproof blanket is suitable for the anti-seepage treatment of ordinary bases such as artificial lakes (rivers) and landfill plants.

Covered waterproof blankets are suitable for areas with higher requirements for waterproofing and seepage prevention, such as tunnels, subways, basements, and other underground buildings and waterscape projects with abundant underground water resources.

Geosynthetic clay liner has good overall performance, high tensile and shear strength. The natural sodium-based bentonite in the middle is an inorganic material. It swells when exposed to water and produces hydration to form an impermeable gel impermeable body. It can store water, and its absorption and water content can reach more than 10 times its weight. It has permanent waterproof performance.


Q: What’s the width of the Geosynthetic clay liner can you produce?

A:3 meters-6 meters can be customized;

Q: What’s roll length of Geosynthetic clay liner can you produce?

A:15-40meters length and can be customized;

Q: What’s the unit weight of Geosynthetic clay liner can produce?

A:4000g/m2-6000g/m2 and can be customized

Q: What is the function of Geosynthetic clay liner?

A: Geosynthetics clay liner’s main function is Waterproofing.

Q: Why is Geosynthetic clay liner used to line landfills?

A: To protect the soil and water at the bottom.

Q: Why do landfills have Geosynthetics clay liner?

A: Reduces the amount of leakage.

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