1 Chemical preparations for use as densifiers on concrete, terrazzo, masonry, natural stone, cast stone, tile, and cement-based surfaces; chemical preparations for use as hardeners on concrete, terrazzo, masonry, natural stone, cast stone, tile, and cement-based surfaces, and specifically excluding paints and oils; chemical preparations in the nature of preservatives for use on concrete, terrazzo, masonry, natural stone, cast stone, tile, and cement-based surfaces; chemical preparations for use as a stain repellent treatment on concrete, terrazzo, masonry, natural stone, cast stone, tile, and cement-based surfaces; chemical preparations for use as a densifier for inorganic or organic flooring surfaces, namely concrete, terrazzo, masonry, natural stone, cast stone, tile, cement-based flooring surfaces, and vinyl-based flooring surfaces; chemical preparations in the nature of preservatives for inorganic or organic flooring surfaces; chemical preparations for use as stain repellent for inorganic or organic flooring surfaces; chemical preparations for use as densifiers, namely, silicate-based densifiers; chemical preparations for use as a densifier for concrete or asphalt surfaces, and specifically excluding paints and oils; chemical preparations for use as a densifier for transportation surfaces, namely, walkways, parking lots, parking structures, roads, bridges, and runways; chemical preparations in the nature of preservatives for concrete or asphalt surfaces, and specifically excluding paints and oils; chemical preparations in the nature of preservatives for transportation surfaces, namely, walkways, parking lots, parking structures, roads, bridges, and runways, and specifically excluding paints and oils; chemical preparations for providing concrete, terrazzo, masonry, natural stone, cast stone, tile, cementitious, and asphalt surfaces with freeze-thaw protection; chemical compounds for curing concrete