High-Performance Impermeable GCL Solution for Engineering & Environmental Projects

In civil engineering projects, impermeability is a key factor that directly determines project safety and service life. The sodium bentonite waterproof blanket (GCL) emerges as a high-reliability, eco-friendly impermeable material, as it combines natural bentonite’s swelling properties with advanced geotextile technology.

Product Overview: What Is Sodium Bentonite Waterproof Blanket (GCL)?
The sodium bentonite waterproof blanket (GCL), also known as geosynthetic clay liner, is a composite impermeable material. We produce it by sandwiching high-quality natural sodium bentonite between two layers of geotextiles (woven or non-woven) through advanced needle-punching technology.
>When it comes into contact with water, the sodium bentonite swells rapidly to form a dense, low-permeability colloidal layer, which effectively blocks water penetration. Unlike traditional waterproof materials, it requires no heating or bonding during construction, making it more convenient and cost-effective.

3. GCL Core Specifications

3.1 Key Technical Parameters
We strictly adhere to ASTM, ISO 9001, ISO 14001, and JG/T 193-2006 standards to ensure consistent product quality. The main specifications of our sodium bentonite waterproof blanket (GCL)include:
1：Material: Natural sodium bentonite (expansion index ≥24 ml/2g) + PP/PET geotextile.
2： Unit Weight: 3000–8000 g/m² (customizable per project needs).
3：Tensile Strength: ≥600–700 N/100mm (depends on geotextile type).
4： Permeability Coefficient: ≤5×10⁻¹¹ m/s, ensuring excellent impermeability.
5： Roll Dimensions: Width 1–6m, Length 30–100m (customizable).
6：Color: Black, white, or customized.

3.2 Outstanding Performance Advantages
First and foremost, GCL features excellent self-healing and impermeable performance. When hydrated under confining load, the sodium bentonite swells 20–28 times its original volume to form a dense barrier.
Additionally, it is eco-friendly and durable. Made of natural sodium bentonite，it causes no environmental pollution and can maintain stable performance for over 70 years , with strong resistance to corrosion and UV rays.
Moreover, it is easy to construct and cost-effective. Your construction team can lay it directly without special equipment, and it eliminates the need for complex bonding processes, significantly reducing labor costs and shortening the construction period.

4. Wide Application Scenarios of GCL

The sodium bentonite waterproof blanket (GCL) is widely used in various engineering and environmental projects, thanks to its versatile performance. Its main application scenarios include:

4.1 Landfill & Hazardous Waste Disposal
It serves as a core part of landfill anti-seepage systems, isolating and filtering leachate to prevent groundwater and soil pollution, which ensures the long-term safety of municipal and industrial landfills.

4.2 Water Conservancy & Landscape Projects
Use it for lining artificial lakes, reservoirs, irrigation canals, and landscape ponds. It effectively blocks water seepage, maintains water levels, and protects the surrounding ecological environment.

4.3 Subway & Underground Engineering
Apply it in subway tunnels, basement waterproofing, and underground garage projects. Its self-healing property can adapt to structural settlement, avoiding water leakage and ensuring project safety.

4.4 Other Applications
It also fits well in slope protection, tailings pond anti-seepage, and roof greening projects, providing reliable impermeable support for various complex scenarios.