Bentomat^® Geosynthetic Clay Liners (GCL)

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 SDN is also a reinforced GCL consisting of a layer of Volclay sodium bentonite between two non-woven geotextiles. The two non-woven geotextiles impart good interface friction between the GCL and adjacent soils or textured geomembranes, making this GCL a cost-effective alternative for moderate to steep slopes requiring good overall liner system stability.

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 STM is a reinforced GCL commonly specified in mining applications. This GCL consists of a layer of Volclay sodium bentonite encapsulated between a woven and non-woven geotextile. The reduced bentonite loading results in a lighter weight product that is more cost-effective and easier to transport to remote mining sites. The lower bentonite weight can serve as a good alternative for projects where hydraulic requirements may not be as stringent.

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 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 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.

Bentomat 600CL is a new product for non-reinforced, low shear strength applications and consists of two light-weight geotextiles encapsulating a layer of Volclay sodium bentonite with a flexible membrane liner laminated to one of the geotextiles. This GCL may be used for flat areas of landfill caps and high hydraulic head conditions in liquid containment applications.