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Polyurethane (PU) Grouting is specially designed for providing water control in static joints or cracks in concrete structures. It is especially effective for cutting off gushing water of high pressure and speed, when used with our very own Unifor plastic packers, manufactured in Singapore. The grout material, when mixed with a certain amount of accelerator, will react with water or moisture and expand, to form a tough, closed-cell rubber that is essentially unaffected by corrosive environment.