Metro Tunnel GCL

Metro Tunnel GCL — GCL (geosynthetic clay liner) with natural sodium bentonite locked between geotextiles, swelling when hydrated to form a self-healing barrier with permeability ≤5×10⁻¹¹ m/s. Ideal composite partner for geomembrane. This page focuses on Metro Tunnel GCL. Contact Hengyang for specifications and pricing.