Concrete preservatives, except paints and oils; cement-waterproofing chemicals, except paints; cement preservatives, except paints and oils; masonry preservatives, except paints and oils; brickwork preservatives, except paints and oils; preservatives for tiles, except paints and oils; damp-proofing chemicals, except paints, for masonry; products-water repellent agents in the nature of chemical-based water repellent coating agents being chemicals for use in industry