Bentonite waterproofing sheets for structures below ground level, suitable for both horizontal and vertical surfaces. TECHNICAL DATA: Lower layer of geo-textile fabric: polypropylene fabric, 140 g/m². Upper layer of geo-textile fabric: non-woven polypropylene fabric, 220 g/m². Layer of bentonite: natural sodium. Aeric mass of bentonite (EN 14196) (12% humidity): 5.1 kg/m². Swelling index (ASTM D 5890): 28 ml/2 g. Coefficient of permeability (ASTM D 5887): < 1E-11 m/s. Static perforation (EN ISO 12236): 2400 N. Longitudinal tensile strength (EN ISO 10319): 14.0 kN/m. Transversal tensile strength (EN ISO 10319): 14.0 kN/m. Peeling (ASTM D 6496): 600 N/m. Bond strength to concrete (ASTM D 903): 3.5 N/mm. Thickness of product (EN 964-1): 6.5 mm. Seal of overlaps: the geo-composite product is self-sealing. Packaging: 1.1 m x 5 m rolls; 2.5 m x 22.5 m rolls; 5 m x 40 m rolls.