Bentomat® CL is a reinforced composite laminate geosynthetic clay liner (GCL) consisting of bentonite clay and a flexible plastic membrane. The bentonite clay is encapsulated between two geotextiles that are needle-punched together, and the flexible plastic membrane is laminated to the outer geotextile surface. Composite laminate GCLs have a maximum permeability 200 times less than conventional compacted clay liners and 10 times less than standard bentonite-based GCLs. 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® CL geo clay liners can completely or partially replace thick, multi lift compacted clay layers in composite landfill liners and caps due to the efficiency of the high swelling natural sodium bentonite clay. 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.