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We investigated the effect of lead and bismuth on the thermal decomposition of initially continuous polycrystalline silver films in this work. It was found that polycrystalline silver films containing bismuth or lead actively de-wetting when there is a liquid phase of the low-melting component. At the same moment, pure films of silver of the same thickness retain their continuity up to higher temperatures. Upon that the decomposition is facilitated by both equilibrium and supercooled melts. The activation energy of the dispergation process, estimated near the melting temperature of the low-melting component, is about 0.5 eV (Pb) and 0.1 eV (Bi). This is lower than the typical