Neoinject WSF 1C is a single-component polyurethane foam that rapidly expands upon contact with water making it ideal for emergency sealing of active water leaks. Its fast-reacting formulation produces a highly expansive closed-cell foam that blocks water ingress instantly. The cured foam is resistant to water and provides a durable barrier against leakage. Common applications include stopping water flow in tunnels basements manholes dams and other structures exposed to groundwater.