Bentonite composite waterproof material
Bentonite composite waterproofing material is an active, sustainable waterproofing membrane composed of natural sodium bentonite as its core waterproofing component, securely encapsulated between two layers of geotextiles (such as nonwovens) or between a geotextile and a layer of HDPE film. Its core principle is to utilize the water-expanding properties of sodium bentonite to form a durable, self-healing, high-density gel waterproofing layer within the structure, effectively blocking water migration.
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Product Description
GCL (Geosynthetic Clay Liner) is a new type of geosynthetics, consisting of a layer of bentonite sandwiched between two layers of geotextiles. It has excellent anti-seepage performance, self-healing ability and durability, and is widely used in various anti-seepage projects.


Mainly composed of bentonite and other materials, it has many advantages:

Excellent waterproof performance: It can effectively prevent moisture infiltration and form a durable and reliable waterproof layer.

Strong adaptability: able to adapt to different terrains and grassroots conditions.

Self repair ability: Small cracks and damages can automatically repair when exposed to water.


This material is commonly used in the following scenarios:

Underground building waterproofing: such as basements, underground parking lots, etc.

Tunnel engineering: ensuring the dryness and structural safety inside the tunnel.


For example, in the construction of a large commercial basement, the use of bentonite composite waterproof materials can ensure that the basement is not invaded by groundwater even under complex geological conditions; In tunnel construction, the use of this material can effectively prevent leakage of tunnel walls and reduce the impact on tunnel structure and functionality.

Product Parameters
Projects/ Technical dataSpecifications
GCL-NPGCL-OFGCL-AH
Weight per unit area(g/m2)≥4000g/m2
Bentonie swell index(ml/2g)≥24≥24≥24
Ethylene blue absorption(g/100g)≥30≥30≥30
Tensile strength (N/100mm)≥600≥700≥600
Racking strength(N/100mm)≥40≥40
(for nonwovwn and woven fabric)
Racking strength(N/100mm)
≥30
(for HDPE films and nonwoven fabric)
Permeability(m/s)≤5.0x110-11≤5.0x110-11
anti-static water pressur0.4Mpa,1h,0.6Mpa,1h,not seepage
not seepage
filtration loss (ml)≤18≤18≤18
Bentonite durability (ml/2g)≥20≥20
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