Abstract: A single- or multi-component adhesive/sealant compositions containing at least one silane-terminated prepolymer, wherein the adhesive/sealant compositions are free of organic heavy metal catalysts, and the silane-terminated prepolymers comprise terminal groups that are selected from among methyldialkoxysilylpropyl, trialkoxysilylpropyl, methyldialkoxysilylmethyl, trialkoxysilylmethyl, or mixtures thereof. In the two-component embodiment, the adhesive/sealant compositions consist of a component A, containing at least one silane-terminated prepolymer of the aforementioned type, and a component B, containing water and thickener. Said adhesive/sealant compositions are used to elastically bond two or more identical and/or dissimilar substrates, in particular in the production of photovoltaic modules, and in the mounting of photovoltaic modules onto roof surfaces and other surfaces.