HydroBloc Si-742-K aqua impregnation keeps mineral surfaces dry, clean and beautiful. The water based silane compound is environmental friendly and dilutable with water. The reactive silane connects with the building material and creates an inseparable connection and water repellent barrier. HydroBloc Si-742-K aqua is made for concrete, sand-lime brick, brick, gas concrete and natural stones. The impregnation resists air pollution, doesn´t create a film or hinder the water vapour permeability. Treated surfaces are perfectly water repellent.