täppisvalandite tootmine õhukeseseinalistes keraamilistes tervikvormides valuprotsessis gaasistuvaid mudeleid kasutades (vt gaasistus; vrd gaasistuvmudelvalu), expendable mold casting process employing disposable, expanded polystyrene patterns to facilitate manufacture of thin, highly refractory ceramic shell molds without parting lines and cores (see: gasification; compare: evaporative pattern casting)