- Geosynthetic Clay Liners

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Bentomat - Geosynthetic Clay Liners

BENTOMAT Geosynthetic Clay Liners available in a wide range of configurations, meeting your project requirements. When designing with GCLs, engineers should consider shear strength, hydraulic performance and chemical compatibility in order to assure a stable, long-lasting and high-performing liner system. BENTOMAT can be configured with various components in order to ensure maximum value and performance. Not all projects have the same performance requirements for the lining system. BENTOMAT is available in a variety of product configurations to meet the needs of your project.

Features of BENTOMAT

  • 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

Standard Reinforced GCL


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.

Non-Reinforced GCL


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.

Composite Laminate GCL


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
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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Landfill lining

GCLs have become the gold standard clay component of composite lining systems used in industrial, hazardous and municipal solid waste landfills. Used alone or in combination with a geomembrane in a composite cover system, GCLs provide significantly lower permeability, improved ease of installation, an increased amount of usable space. In many cases GCLs are more cost-effective than traditional compacted clay liners. GCLs are also not subject to deterioration from differential settlement and freeze-thaw cycles,...

Geosynthetic Lining for Mining Industry

Geosynthetics are used in construction of various components of modern mining facilities, including process solution ponds, heap leach pads, stormwater containment, wastewater treatment ponds and closures. Harsh environmental conditions provide a challenge to engineers designing the projects. In addition, increasing environmental and cost pressures are requiring lining systems to achieve greater performance levels than ever. GCLs are rapidly becoming a desired component of mining liner systems because of the...

Coal Combustion Residuals Disposal for Power Plants

Coal combustion residuals (CCR) are generated during the power generation process and can include fly ash, bottom ash, boilerslag, and flue gas desulfurization (FGD) residuals. CCRs contain trace concentrations of heavy metals and therefore cannot be dumped or stored where rainwater can leach the metals. Liner systems can be used to contain the coal combustion by-products and protect them from leaching into the environment.

Geosynthetic Lining for Ponds

GCLs can be used for decorative ponds, golf course water features, fish ponds, water reservoirs, and wastewater lagoons. Their self seaming installation requires no specialized equipment, and their self-healing characteristics promote long life and high performance.

Geosynthetic Lining for Secondary Containment

GCLs can be used around and underneath secondary containment above ground petroleum storage tanks. of above ground storage tanks and are easy to install. Installation details and penetrations are easily handled using simple installation techniques and can be quite cost effective.

Geosynthetic Lining for Canals, Stormwater Impoundments and Wetlands

Composite laminated GCLs offer puncture and tensile strengths beyond conventional geomembranes. These GCLs offer the low permeability of a geomembrane combined with the high swelling and self healing characteristics of a traditional GCL. With their ease of installation, cost-effectiveness and resilience to physical and climate issues, GCLs are often specified in canals, stormwater impoundments or wetlands to control seepage and conserve valuable water where native soils are too permeable.

Geosynthetic Lining for Highway and Civil Applications

GCL can be used in highway and civil applications such as at airport de-icing facilities used to remove ice build up on the surfaces of planes. During the application process, glycol-based de-icing fluids can leak into local stormwater runoff, potentially causing pollution. CETCO GCLs were found compatible with de-icing fluid (glycol diluted 50/50 with water). GCLs can also be used to line roadway drainage swales for containment and prevent excessive percolation, thereby minimizing potential for groundwater...

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