Cement-waterproofing chemicals, except paints; Industrial chemicals; Products for protecting concrete (chemicals); Sealants (chemicals) for the sealing of surfaces; Surface coating compositions (chemicals), other than paints; Chemical preparations for hardening surfaces; Chemical preparations for providing resistance to abrasion; Chemical preparations for the treatment of concrete; Chemical preparations for waterproofing masonry; Chemical preparations to prevent mildew; Chemical compositions for strengthening stonework; Chemical products for use as anti-bacterial additives for liquids; Agglutinants for concrete; Preservatives for concrete (except paints and oils); Sealing preparations (chemical); Surface-active substances; Bactericides (other than for medical and veterinary use); Products to remove moisture; Coatings to protect concrete from water (other than building materials, paints or oils); Coatings to protect stone from water (other than building materials, paints or oils); Protective coatings for repelling water (chemical); Moisture repellant coatings (other than paints); Liquid coatings (chemical); Hardening preparations; Synthetic silica