Product Description

Bentomat products are the only GCL that offer Supergroove technology, a groove in the nonwoven fabric that allows the bentonite to migrate out and self-seam at the overlap. This feature eases the installation process by eliminating the need for supplemental bentonite. All Bentomat geosynthetic clay liners feature granular bentonite, which creates less dust during installation than powdered bentonite and is more likely to stay in place once deployed. The high needlepunch density of Bentomat provides higher peak internal shear strengths, without relying on supplemental processing.


  • SupergrooveTM technology allows bentonite to migrate out and self-seam at the overlap
  • Granular bentonite creates less dust during installation and is less likely to shift during needlepunch reinforcement
  • Needlepunch reinforcements allows Bentomat to withstand shear stresses on steep slopes
  • Fully hydrated GCL has a permeability of 5 x 10-9 cm/sec, approximately 20 times lower than a typical CCL


Bentomat ST

BENTOMAT ST is the most commonly specified GCL in the world, proving ideal for standard applications involving slopes up to 3H: 1V. Bentomat ST consists of a layer of Volclay sodium bentonite encapsulated between woven and non-woven geotextiles, which are needle-punched together to provide internal reinforcement. The internal reinforcement minimizes clay shifting, thus allowing the GCL to maintain consistent low permeability and maximum performance under a wide variety of field conditions.

Bentomat DN

BENTOMAT DN is commonly used in some of the most demanding applications including canyon landfills in the western United States, where slopes are as steep as 1.5H: 1V. This GCL is reinforced and consists of a layer of Volclay sodium bentonite between two heavier weight non-woven geotextiles, making this GCL suitable for applications requiring high internal and interface shear strength.


Bentomat 200R
BENTOMAT 200R is a needle-punched GCL consisting of a layer of Volclay sodium bentonite encapsulated between light-weight non-woven and woven geotextiles. This GCL is an excellent cost-effective alternative to compacted clay as the low-permeability liner under a geomembrane in applications with slopes up to 10H: 1V, or where high internal shear strength is not critical. 


Bentomat CL

BENTOMAT CL is a reinforced GCL consisting of two carrier geotextiles encapsulating a layer of Volclay sodium bentonite, with a flexible membrane liner laminated to one side. This GCL provides excellent hydraulic performance and has puncture and tensile strengths beyond conventional plastic membranes. These characteristics make this GCL applicable for use in landfill covers, ponds and liquid containment projects with slopes up to 3H: 1V. 

Bentomat CLT rendering  
BENTOMAT CLT is a reinforced GCL consisting of a layer of Volclay sodium bentonite between two geotextiles and laminated to a textured HDPE geomembrane. The addition of the geomembrane to the GCL increases the hydraulic resistance, and the textured surface increases the interface friction between the GCL and adjacent substrate. These characteristics make this GCL ideal for more demanding landfill covers and liquid containment applications involving steep slopes.
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