Good flexibility geosynthetic clay layer used in underground reservoirs

The properties:
The core layer of sodium bentonite is a natural clay mineral that significantly expands when it absorbs water.
The two outer geotextile layers hold the bentonite in place and are typically needle-punched together to provide shear strength and durability.
Hydration and Sealing:
When the GCL is exposed to water or moisture from the subgrade, the bentonite hydrates, swells, and forms an impermeable, low-permeability clay barrier.

The Benefits: 
Cost-Effective:
Offers a more economical and faster installation compared to traditional compacted clay liners.
Environmentally Compatible:
Made from natural, non-toxic materials that are compatible with soil and groundwater.
Self-Sealing:
The expansive nature of bentonite provides a self-sealing and self-healing capability to repair minor damage.
High Performance:
Provides a durable and long-lasting hydraulic barrier, resistant to the physical and chemical breakdown common in harsh environments.