BECLAY Geosynthetic Clay Liners

BECLAY geosynthetic clay liners (GCLs) combine the natural sealing properties of bentonite with the durability of high-quality geotextiles, ensuring long-term, reliable sealing performance in landfill, road, and hydraulic engineering applications.

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Advantages of BECLAY Geosynthetic Clay Liners

Good sealing performance with self-healing effect

Strong composite bonding through full-surface needle punching

Cost-effective and efficient sealing system

Resource-efficient due to minimal layer thickness

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Product Details and Properties

BECLAY Tondichtungsbahnen bestehen aus drei Komponenten: einer geotextilen Deckschicht, einer gleichmäßig verteilten Bentonitgranulat-Schicht und einer geotextilen Trägerschicht. Diese Schichten sind vollflächig miteinander vernadelt und bilden eine kompakten, stabilen Verbundstoff.

Hauptbestandteil der BECLAY Tondichtungsbahn ist der enthaltene Natriumbentonit mit einem Montmorillonit-Anteil von über 90 %. Dieses Tonmineral quillt bei Wasserkontakt stark auf und sorgt für die sichere Dichtwirkung. Die Verwendung von Bentonitgranulat anstelle von Pulver reduziert zudem die Staubentwicklung und verbessert das Lagerungsverhalten.

Industrial production and continuous quality control ensure a homogeneous, reliable sealing layer with consistent impermeability.

Structure and Function

BECLAY

This variant consists of a geotextile cover layer, a middle layer of bentonite granules, and a geotextile carrier layer. The sandwich-like construction provides a uniform sealing layer with consistent performance. Full-surface needle punching ensures high shear strength and stability, even on slopes.

1 PP fibers | 2 PP woven geotextile | 3 Bentonite granules | 4 PP nonwoven fabric

BECLAY GDA CL

Die Variante BECLAY GDA CL ist zusätzlich mit einer PE-Membran ausgerüstet. Diese werkseitig aufgebrachte Folie schützt den Bentonit vor Austrocknung und sorgt gleichzeitig für eine zusätzliche Barrierewirkung. BECLAY GDA CL eignet sich daher besonders für Anwendungen mit hohen Anforderungen an die Abdichtungssicherheit und Trennwirkung.

Both variants utilize the natural swelling behavior of bentonite to form a self-healing, watertight layer upon contact with water. Minor damages are automatically sealed by the internal swelling pressure.

1 PE membrane | 2 PP woven geotextile | 3 Bentonite granules | 4 PP nonwoven fabric

Application Areas of BECLAY Geosynthetic Clay Liners

BECLAY geosynthetic clay liners are used in various civil and environmental engineering applications requiring a long-lasting liquid barrier. Typical areas of use include:

Rainwater retention basin

BECLAY liners are used to seal retention and storage basins, preventing water loss and separating groundwater from surface water.

bentonitmatte Deponie Oberflächenabdichtung

Groundwater protection in traffic areas

In road and transport construction, BECLAY systems prevent hazardous substances from entering the groundwater. They comply with RiStWag guidelines (Guidelines for Structural Measures in Water Protection Zones) and contribute to sustainable environmental protection.

Multi-storey and underground car parks

BECLAY liners provide reliable and cost-effective waterproofing for foundation slabs in parking structures, preventing infiltration of liquids into the subgrade.

For Landfill sites and Remediation of Contaminated Sites we recommend using clay liners with LAGA approval. More information can be found here:

Go to Bentonite Mats with LAGA approval

Technical Data

Properties	GDA	300/200	GDA CL*
Product type	All-over needle-punched clay liner		All-over needle-punched clay liner with additional PE membrane
Raw material	Non-woven: PP. Inlay: Bentonite. Woven: PP		Non-woven: PP. Inlay: Bentonite. Woven: PP. Membrane: PE
RiStWag Sealings	yes	yes	yes
Areas of application
Dike and hydraulic structures	○	○	○
Retention basins	●	●	●
Road and traffic areas	●	●	○
Canal structures	●	●	○
Underground / multi-storey car parks	○	●	○

● suitable | ○ partly suitable (project-related assessment necessary)

Special types available upon request. | 0.2 – 1.5 mm, Available with or without surface texture.

Request further product information

Sustainability and Resource Efficiency

BECLAY geosynthetic clay liners are particularly resource-efficient. Unlike compacted clay liners, which require layer thicknesses of up to 1 meter, BECLAY liners achieve equivalent sealing performance with a thickness of only about 1 cm. This results in significant savings in raw materials, transport, and energy.

Ein Beispiel verdeutlicht den Unterschied: Eine Deponiefläche von 4.500 m² erfordert bei einer mineralischen Dichtung etwa 2.250 m³ Ton – das entspricht rund 175–225 LKW-Ladungen. Die gleiche Fläche lässt sich mit 22 Rollen BECLAY abdichten – also nur einem LKW. Das reduziert CO₂-Ausstoß, Transportaufwand und Bauzeit erheblich.

Using BECLAY contributes actively to sustainable construction and reduces the environmental impact of infrastructure projects.

200 truckloads
vs.
1 truckload

4,500 m² compacted clay liner (0.5 m thickness)

= 2.250 m³ of clay

4.500 m² BECLAY Geosynthetic Clay Liners

= 22 rolls

Installation of BECLAY Geosynthetic Clay Liners

The installation of BECLAY geosynthetic clay liners is quick and straightforward when the provided installation guidelines are followed.

A flat, stable, and dry subgrade is essential. The liners are installed in the direction of the slope. The 30 cm wide, factory-marked overlap areas are sprinkled with loose bentonite granules to ensure a homogeneous and watertight joint.

After installation, BECLAY liners must be covered with appropriate backfill material on the same day to prevent uncontrolled hydration of the bentonite.

Comprehensive installation and project-specific instructions are available upon request.