As an alternative to a 40 cm thick clay liners, the approximately 10 mm thick Bentofix® geosynthetic clay liner, manufactured with high swelling natural sodium bentonite, is used. The robust cover and carrier geotextiles used in the construction of Bentofix® are designed to withstand rough installation loads. Bentofix® is uniformly manufactured with direction-independent needlepunching (fibre reinforcement) over its entire surface area, with more than 2 million fibres per square metre.
Depending on the existing soil conditions and slope lengths, slope inclinations of 2.5h:1v or greater are possible, due to the surface structure of the needlepunched cover and carrier geotextiles and the large internal friction angle. In poor soil conditions or on steeper slopes, Secugrid® geogrid can be used to further ensure slope stability.