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GEOSYNTHETIC CLAY LINER

Geosynthetic clay liners (GCL) are manufactured by trapping bentonite-based raw material between woven or non-woven geotextiles, and joining them with a special needling method. Upon contact with liquid, the bentonite in between the two geotextiles swells and forms an impermeable layer. GCLs, being dynamic geosynthetic barriers, can swell up to approximately 20 times their original size upon contact with liquid. This impermeable layer prevents the seepage of hazardous chemicals into the ground. Similarly, it can be used to prevent all liquids from seeping underground.

Usage areas


  • Water reservoirs

  • Irrigation channels

  • Irrigation, fire, and golf course ponds

  • Mine waste storage sites

  • Solid waste storage sites

  • Ponds

  • Soil and fill reinforcement

  • Stream beds and trench stabilization

  • Transportation projects (highways, railways, airports)

Product features

Provides significant cost advantages compared to compressed clay layer applications.
Delivers better impermeability function with 100-150 times less volume compared to a similar impermeable clay layer.
Resistant to natural conditions.
Offers significant savings in storage and transportation costs.
Possesses superior hydraulic and mechanical properties due to natural bentonite and surrounding woven and non-woven geotextiles.
Easier and faster to transport and apply compared to the much larger volume of compressed clay layers.
Does not require special equipment for roll deployment.
Long-lasting.

Specification Table

PRODUCT TECHNICAL INFORMATION FORM (PTIF)
Product Name   Geosynthetic Clay Liner (GCL)
Base Material   Waterproofing material created by wrapping natural sodium bentonite with high-strength geotextiles
Width-Length (m)   5,0 - 50 
Packaging   In nylon packaging - Rolled
Color   Black
MECHANICAL AND CHEMICAL PROPERTIES
Properties  Standard  Results
Upper Layer (Polypropylene), (g/m2)  TS EN 14196  200-300
Lower Layer (Polypropylene), (g/m2)  TS EN 14196  100-200
Bentonite (g/m2)  TS EN 14196  4000-5000
Montmorillonite Content (%)  ASTM C 837 ≥ 70
Tensile Strength (Width-Length), (kN/m)  TS EN ISO 10319 ≥ 11
Elongation Ratio (Width-Length), (%)  TS EN ISO 10319 10,0 - 16,0 (Boy)
6,0 - 10,0 (En) 
Peel Strength (Width-Length) ASTM D 6496 ≥ 360
Water Permeability (m/s)  TS EN 16416 ≤ 5 x 10-11
Swelling Index (mL/2g)  ASTM D 5890 ≥ 24
Static Puncture Resistance (CBR) (kN)  TS EN ISO 12236 ≥ 1,8
Flow Index (m3/(m2s))  TS EN 16416 ≤ 1x 10-8
Fluid Loss (mL)  ASTM D 5891 ≤ 18