Colloidal silicon dispersants; Magnesium ferro-silicon; Pure silicon; Semiconductor silicon; Silicon; Silicon carbide (raw material); Silicon dioxide; Silicone resins; Silicones; Single crystals of silicon; Gasket cement (adhesive); Gasket making materials (chemicals); Chemicals for the surface treatment of metals; Chemicals for use in industry; Chemicals for use in manufacture; Chemicals for use in the rubber industry; Chemicals used in industry; Engine-decarbonising chemicals; Raw chemicals; Sealants (chemicals) for the sealing of surfaces; Adhesives for use in building; Adhesives for use in the building industry; Chemical compositions for use in the building industry; Chemical products for use as additives for building materials; Chemical products for use in the manufacture of building materials; Chemicals for use as additives in building materials (except paints); Coatings for the finishing of masonry (chemicals) (other than paints or building materials); Coatings for the finishing of surfaces (chemicals)(other than paints, oils or building materials); Preservatives for buildings (except paints and oils); Preservatives for the surfaces of buildings (chemical) (other than paints or oils); Protective coatings for buildings (other than paints or oils); Sealing compounds for use in building (chemical); Structural adhesives for building use; Synthetic resins for use in the treatment of surfaces of buildings; Chemicals for use in the automotive industry; Structural adhesives for automotive use; Chemical additives for use in manufacture; Chemical compounds for use in the manufacture of adhesives; Chemical products for use in the manufacture of adhesives; Chemical substances for use in the manufacture of products for household use