Geosynthetic Clay Liner Natural sodium bentonite can be encapsulated between two layers of geotextile to form a waterproofing membrane called geosynthetic clay liner (GCL). GCL comes in rolls and can be laid over any areas needing waterproofing, such as tunnel, landfill, underground structure and canal lining. Fibers from the non-woven geotextile are needle punched through the layer of bentonite and incorporated into the woven geotextile. When hydrated under a confining load, the bentonite swells to form a low permeability clay layer with the equivalent hydraulic protection of several feet of compacted clay.
Specifications of Geosynthetic Clay Liner 1) GCL-NP stands for Needle Punched Geosynthetic Clay Liner. 2) GCL-OF stands for Needle Punched Geosynthetic Clay Liner with PE film.