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