GCL(Geosynthetic Clay Liner)
Product Specifications
- Weight per m² (kg/m²): 3 kg/m², 3.5 kg/m²,3.8 kg/m²,4 kg/m²,4.5 kg/m²,4.8 kg/m², 5 kg/m²,5.5 kg/m²,6 kg/m²
- Standard Width: 1 m ,2 m,3 m,4 m
- Roll Length: 10 m or customzied length
LIAONING HENGYU NEW MATERIALS CO LTD
GCL (Geosynthetic Clay Liner) - Sodium Bentonite Waterproofing
High-performance GCL (Geosynthetic Clay Liner) designed for ultimate hydraulic barriers. Combining natural sodium bentonite with robust needle-punched geotextiles, our GCL provides self-sealing protection for landfills, artificial lakes, and complex civil engineering projects.
- Superior Barrier: Hydrostatic pressure resistance up to 1.0MPa
- Specifications: Mass per unit area 3000g – 6000g/m²
- Self-Healing: Natural expansion fills cracks and prevents leakage
- Flexible Dimensions: Roll width 3m – 6m; customized lengths available
Reliable environmental solutions with strict JG/T193-2006 quality compliance.
Premium Sodium Bentonite GCL rolls ready for global shipment.
Product Overview
GCL (Geosynthetic Clay Liner) is a high-performance environmental barrier manufactured by encapsulating a layer of high-swelling sodium bentonite between needle-punched geotextiles and HDPE woven fabrics. It combines the flexibility of geosynthetics with the superior hydraulic sealing properties of natural clay.
How does GCL sodium bentonite work?
The core of GCL is the natural sodium bentonite particles. When hydrated under confinement, the bentonite swells to form a low-permeability mastic barrier. This unique 3mm layer provides a seal equivalent to 100 times the compactness of a 30cm thick traditional clay liner.
Liaoning Hengyu utilizes advanced needle-punching technology to lock the bentonite in place, ensuring it won't shift or leak even on slopes. Our production line strictly adheres to JG/T193-2006 standards to guarantee consistent mass per unit area and peel strength.
Our GCL offers excellent aging resistance and remains stable over long periods in various soil pH levels, making it the most reliable choice for permanent anti-seepage projects.
Typical Applications
- Landfill base and capping systems for ultimate waste containment
- Artificial lakes, landscaping ponds, and ornamental water features
- River channels, reservoirs, and agricultural irrigation canals
- Subway stations, basements, and underground tunnel waterproofing
- Environmental protection for tailings dams and secondary containment
- Anti-seepage for roof gardens and complex building foundations
Core Advantages of GCL
Our Geosynthetic Clay Liner (GCL) offers superior hydraulic performance and environmental safety for landfill liners, water conservancy, and underground infrastructure.
High Compactness
Sodium bentonite forms a high-density diaphragm under water pressure. At just 3mm thick, its impermeability is equivalent to a 30cm thick traditional compacted clay layer.
Permanent Waterproofing
As an inorganic material, bentonite does not age or corrode. It features "self-healing" properties, where the clay expands to automatically seal small cracks or punctures in the liner.
Simple & Fast Installation
Compared to geomembranes, GCL installation is straightforward. It requires no welding—simply overlapping with bentonite powder. It can even be installed in temperatures below 0°C.
Green & Sustainable
Made from natural sodium bentonite, our GCL is non-toxic and harmless to the environment. It is an ideal ecological material for artificial lakes and landscape ponds.
High Peel Strength
Using advanced needle-punching, the fibers are entangled through the bentonite layer, providing high internal shear strength for stable performance on steep slopes.
Project-Specific Specs
Available in 4000g/m² to 6000g/m² variants. Liaoning Hengyu provides GCL-NP, OF, and AH types to meet specific project demands for hydrostatic pressure and chemical resistance.
Technical Indicators
Standard Compliance: JG/T193-2006 (Geosynthetic Clay Liner)
| Properties (Units) | Technical Data | ||
|---|---|---|---|
| GCL-NP | GCL-OF | GCL-AH | |
| Bentonite Mass per Unit Area (g/m²) | ≥ 4000 (Standard Value) | ||
| Bentonite Swelling Index (mL/2g) | ≥ 24 | ≥ 24 | ≥ 24 |
| Blue Absorption Value (g/100g) | ≥ 30 | ≥ 30 | ≥ 30 |
| Tensile Strength (N/100mm) | ≥ 600 | ≥ 700 | ≥ 600 |
| Peel Strength (N/100mm) | ≥ 40 (NW to Woven) | ≥ 40 (NW to Woven) / ≥ 30 (PE to NW) | — |
| Permeability Coefficient (m/s) | ≤ 5.0 × 10⁻¹¹ | ≤ 5.0 × 10⁻¹² | ≤ 1.0 × 10⁻¹² |
| Hydrostatic Pressure (0.4/0.6MPa, 1h) | No Leakage (0.4MPa) | No Leakage (0.6MPa) | No Leakage (0.6MPa) |
GCL Production & Quality Control
Liaoning Hengyu New Materials Co Ltd operates a specialized production line for GCL (Geosynthetic Clay Liner), ensuring the precise distribution of premium sodium bentonite within high-strength geosynthetics for consistent waterproofing.
Manufacturing Process
- Selection of high-purity natural sodium bentonite and additives
- Precise distribution of bentonite between needle-punched and woven geotextiles
- Intensive needle-punching to lock bentonite particles into a stable matrix
- Optional HDPE geomembrane lamination (for GCL-OF type)
- Automatic tension control, edge trimming, and protective roll packaging
Our advanced needle-punching technology ensures that the bentonite is evenly distributed and does not shift, maintaining a uniform mass per unit area even on steep slope installations.
Testing & Inspection
- Bentonite quality: Swelling index (≥24mL/2g) and Blue absorption test
- Finished GCL: Unit weight monitoring (3000g - 6000g/m²)
- Mechanical: Peel strength and Tensile strength (JG/T193-2006 compliance)
- Hydraulic: Permeability coefficient and Hydrostatic pressure resistance
- Roll check: Dimension verification, labeling, and appearance inspection
We provide internal laboratory test reports for every batch. Third-party certifications from SGS, BV, or INTERTEK are available to support your international tenders and project requirements.
GCL Packing, Delivery & Installation
Packing & Logistics
- Roll Dimensions: Width 3m - 6m; Length 30m - 50m (customizable)
- Moisture Protection: Each roll is vacuum-sealed in heavy-duty waterproof plastic film to prevent premature hydration
- Labeling: Detailed tags showing GCL type (NP/OF/AH), roll weight, and batch number
- Secure Loading: Specialized handling for 3000g-6000g/m² heavy rolls to ensure safety during container sea freight
Liaoning Hengyu coordinates global logistics from our facility, ensuring GCL arrives dry and ready for immediate deployment on site.
GCL Installation Guidelines
- Surface Prep: Ensure subgrade is flat and free of sharp debris, standing water, or loose stones
- Deployment: Unroll the GCL with the non-woven side facing the liquid to be contained (or as per design)
- Joint Treatment: Overlap edges by 15-30cm and apply sodium bentonite powder (mastic) at the joints for a seamless seal
- Fixing: Secure on slopes using nails and washers; GCL can be installed in temperatures as low as 0°C
- Immediate Cover: Backfill with soil or cover with a protective layer promptly after inspection to avoid hydration from rain
GCL is the shortest construction period material among existing waterproofing options. Our technical team can provide overlap details and slope stability analysis for your specific tender.
More Geosynthetics from Liaoning Hengyu
Combine short fiber geotextile with our geomembrane, composite materials and other geosynthetics for integrated solutions.
Request Free GCL Samples & Factory Price
Share your project requirements and we will recommend the optimal GCL (Geosynthetic Clay Liner) specifications (NP/OF/AH) with a competitive direct-from-factory quotation.
Our technical team typically replies within 12 hours with technical data sheets (TDS), price lists, and container loading solutions.
- Project Type: (e.g., Landfill, Artificial Lake, Tunnel, or Canal)
- GCL Specification: Required weight (4000g-6000g/m²) or specific model (GCL-NP/OF)
- Total Quantity: Total square meters (m²) and estimated delivery timeline
- Logistics: Destination port and preferred Incoterms (FOB/CIF/DDU)
* Note: GCL is a heavy material; we offer optimized loading plans to maximize container space and reduce your freight costs.
GCL (Geosynthetic Clay Liner) – Frequently Asked Questions
Q1: How do I choose between GCL-NP and GCL-OF types?
Selection typically depends on the hydrostatic pressure and the nature of the liquid being contained. GCL-NP (Needle-punched) is ideal for standard landfills and artificial lakes. GCL-OF (Film-coated) adds an HDPE geomembrane layer, offering double protection and even lower permeability (≤5.0×10⁻¹² m/s), making it suitable for high-pressure or critical environmental projects.
Q2: Does your GCL meet international engineering standards?
Absolutely. While we strictly manufacture according to JG/T193-2006, our GCL also complies with ASTM and GRI-GCL3 international standards. We can customize the bentonite mass (3000g–6000g/m²) and peel strength to match your specific tender specifications or local national requirements.
Q3: What are the storage requirements for GCL during shipment?
Because GCL contains active sodium bentonite, it must be kept dry until installation. Liaoning Hengyu uses double-layer waterproof packaging for all exports. We typically deliver within 10–15 days, ensuring the product is transported in dry containers to maintain its full swelling capacity.
Q4: Can we request a GCL sample for laboratory testing?
Yes, we provide free A4-sized GCL samples for your quality appraisal. For large-scale pilot tests, we can also arrange small trial rolls. Please provide your courier account (DHL/FedEx) for freight collection, and we will include a full Technical Data Sheet (TDS) and our latest test reports in the package.