The science behind PU injection grouting lies in the reactive nature of polyurethane. There are two main types: hydrophobic (which repels water and is best for stopping active gushing leaks) and hydrophilic (which absorbs water to form a flexible gel). When the liquid resin meets the water inside your walls or ceiling, it foams and hardens rapidly. This expansion ensures that even the... https://shakuraconstruction.sg/services/pu-injection-grouting/