Bentonite Sheet

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Bentonite Sheet

Bentonite with High Density Polythylene

Bentoline Sheet expands upon contact with water, forming a gel (GLL) type impermeable layer under compaction, and exhibits excellent self-sealing properties that repair damaged waterproof layers.

It is a dual composite waterproofing sheet made by combining physically and chemically strong and durable HDPE with sodium bentonite, representing the most technologically advanced bentonite waterproofing sheet for underground external waterproofing.

Dual composite bentonite waterproofing sheet = HDPE + Bentonite

Bentonite Sheet Characteristics

01
Complementary Dual Waterproofing Structure

This dual composite waterproofing sheet is designed to achieve technically perfect waterproofing by combining
only the advantages of two types of waterproofing materials through a complementary waterproofing mechanism.

02
Excellent Workability, Time-Saving, and Versatility

Installation is possible even on wet concrete surfaces, and it can be applied easily depending
on construction conditions and climate.

Compared to traditional waterproofing methods,
the process is simpler, reducing construction time.
It allows versatile applications on complex structures and
is particularly effective on corners and reverse waterproofing areas.

03
Permanence of Function and Performance

The natural inorganic bentonite layer is placed in contact with the concrete, preventing deterioration
of the waterproofing layer due to aging or heat.

The waterproofing function and effectiveness last for the lifespan of the structure.

04
Ease of Inspection and Reduced Maintenance Costs

On-site inspection and calibration are possible during construction, and corrections or adjustments can be easily performed.


When installed according to standard methods and site conditions, the unique waterproofing properties minimize maintenance costs.

05
Excellent Chemical Resistance

Bentonite particles are treated with special polymer coating,
providing stable impermeability against chemical substances such as contaminated water.

06
Self-Healing Properties

In the event of cracks in the waterproofing structure or damage to the bentonite mat itself,
its excellent swelling properties provide
self-sealing and self-healing effects, ensuring stability against other potential issues.

Bentonite Sheet Physical Properties

Test Item Unit Quality Standard Test Condition
Weight per Unit Area g/m2 4,800 or more KS M 3736
Hydrostatic Pressure - No leakage
Low-Temperature Resistance Test - No abnormality
Permeability Coefficient cm/sec -
Falling Impact Test - No abnormality
Bentonite Layer Swelling Ratio % 650 or more
HDPE Layer Tensile Strength N/cm2 2.452 or more
Tear Strength N/cm 392.3 or more
Elongation % 450 or more

Water-Soluble Film Bonded Bentonite Sheet

(Water-Soluble Film + Sodium Bentonite + HDPE)
This product is protected with a water-soluble film to prevent the loss of bentonite granules during transport, installation, and storage.

Water-Soluble Film
Bonded Bentonite Sheet

Bentonite Sheet

Bentonite Sheet Waterproofing Mechanism

Even if the high-density sheet waterproof layer is damaged and water infiltration occurs, the bentonite layer in contact with the concrete provides watertightness.
Through its self-sealing effect, it not only repairs the damaged areas of the waterproof layer but also controls lateral movement of infiltrating water along the concrete.