Bentomat® DN is a reinforced bentonite-based geosynthetic clay liner (GCL) comprised of two polypropylene nonwoven geotextiles that are needle-punched together, encapsulating a layer of sodium bentonite clay between the two textiles. GCLs are a great secondary or supportive layer used in conjunction with the right geomembrane. GCLs are known to provide consistent, very-low permeability and have the unique ability to seal around penetrations, self-heal punctures, and self-seam at the overlaps. Bentonite needle-punched GCLs provide a durable reinforcement to withstand shear stresses on steep slopes and the high needle-punch density provides higher peak internal shear strengths.
Bentomat® DN features granular bentonite, which creates less dust during installation than powdered bentonite, and is less likely to shift through the needle-punched reinforcement providing a consistent hydraulic performance. Standard bentonite-based GCLs are designed to provide a hydraulic barrier against many leachates. The swelling bentonite fills up pore space and constricts flow paths to water, resulting in a low-permeability hydraulic barrier. Bentomat® DN is frequently used in environmental containment applications and is a high-performance, cost-effective alternative to compacted clay liners.