The subject of this paper is the production of fine lead and tin powders and their porous filters, making use of the solid-state tin phase transition and intermetallic compound decomposition. The multiple tin allotropic conversion allows the manufacture of 1 mu m tin powder and filters which can filter particles of 5 mu m diameter. The method of lead and tin alkalimetal compound decomposition allows production of a porous sponge metal filter in any prefabricated mould, while retaining a high level of purity in the metal. Such filters are of particular interest and use due to their large active surface and high purity.