... Good tenacity, low shrink 4. Low price Hydrophilic Polyurethane Foam Liquid Agent For Concrete Advantages1. It has low sticky degree, so doesn ... . Filling the tunnels, dams, basement, brick wood, dry, wet concrete member crack, actual bond all contact surfaces.2. Crack injection ... contact with water , completely foam expansion and solidification. Hydrophilic Polyurethane Foam Liquid Agent For Concrete