Adhesive and sealing compounds suitable for sealing and jointing substrates made of materials such as glass, metal or plastics, contain (A) a silicic acid hetero condensation polymer which is obtained by hydrolysis and condensation of organosilanes and, if necessary, silicon-functional silanes, organofunctional silanes and/or oxide components; (B) a polymerization or cross-linking catalyst and (C) if necessary, an organic monomer or prepolymer copolymerizable with the silicic acid hetero condensation polymer.