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The siloxane fluid is one of a linear methylhydrogen siloxane polymers, linear methylhydrogen-methylalkyl siloxane copolymers, methylhydrogen cyclosiloxane polymers, or methylhydrogen-methylalkyl cyclosiloxane copolymers.
Rendering masonry architectural building materials water repellent by incorporating into the masonry architectural building material an additive which is a mixture of (i) a water soluble silane coupling agent and (ii) an emulsion which includes water, at least one surfactant, and a siloxane fluid.