One-component, ultra-fluid polyurethane resin applied by injection for waterproofing structures and ground and rocks subject to intense percolating water. The reaction time may be regulated. TECHNICAL DATA: Mixing ratio: resin: catalyst = 1: 0.1-0.2 by weight. Storage: 6 months. Application: injection. Consumption: in the open air, a mixture of 1 kg of RESFOAM 1 KM (resin) + 0.1 kg of RESFOAM 1 KM AKS (catalyser) forms 50 litres of foam upon contact with 0.1 litre of water. Packaging: – RESFOAM 1 KM (resin): 20 kg plastic drums. – RESFOAM 1 KM AKS (catalyser): 1 kg plastic drums.