... Geosynthetic clay liners ,GCL seepage-proofing thickness:4-6mm material:bentonite+geotextile+geomembraneGeosynthetic clay liners ,GCL, impervious blanketGeosynthetic clay ... base liner applications under roads, railways, secondary containment for above ground tank farms, as well as within ... ponds, rivers and lakes. They are also used for waterproofing of buildings and other similar structures. Rolled ...