Bentonite sheet for waterproofing structures below ground level where saline water is present. TECHNICAL DATA: Lower layer: polypropylene fabric. Upper layer: non-woven polypropylene fabric. Layer of bentonite: natural sodium bentonite admixed with polymers resistant to contaminants. Areal density (EN 14196) (12% humidity): 5.3 kg/m². Swelling index (ASTM D 5890): 28 ml/2 g. Hydraulic conductivity (ASTM D 5887): 1E-11 m/s. Static puncture resistance (EN 12236): 2.4 kN. Longitudinal tensile strength (EN ISO 10319): 14.0 kN/m. Transversal tensile strength (EN ISO 10319): 14.0 kN/m. Peeling (ASTM D6496): 625 kN. Adhesion to concrete (ASTM D 903): 3.1 N/mm. Thickness of product (EN ISO 9863-1): 6.5 mm. Packaging: 5 m wide x 40 m long rolls.