Asmaco Gold Universal Multi Foam is based on MDI (Methylene Diphenyl iso cyanate) polyurethane pre- polymer & accelerator. The system only reacts when it comes in contact with water, producing a relatively stiff & inert polyurethane foam (PU). It is a 100% solid & solvent free polyurethane grout for quick temperrory closing & sealing of water bearing cracks, cavities and leaks under hydrostatic pressure. The systems foams to 30-40 times its volume in the presence of water & can be an effective means of arresting running water leakage.