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Dajin sodium bentonite waterproof blanket (pad) 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

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GCL-Composite bentonite geosynthetics Clay Liner

The base bentonite particles are fully compressed with the nonwoven geotextile through special equipment so that the bentonite particles are firmly sandwiched between the two layers of geotextile and are more resistant to water erosion.

Bentonite is a natural inorganic material, will not undergo aging reaction, has good durability, is non-toxic, non-corrosive, and is a green environmental protection material

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 bentonite waterproof blanket 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.

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







Factors affecting product prices:

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.

This product 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 GCL can you produce?

A:3 meters-6 meters can be customized;

Q: What’s roll length can you produce?

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

Q: What’s unit weight can you produce?

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

Q: What’s the material of the geotextile?

A: PP or PET material can be customized. 

Q: What is the function of geosynthetics clay liner?

A: Waterproofing.

Q: Why is clay used to line landfills?

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

Q: Why do landfills have liners?

A: Reduces the amount of leakage.