The new transparent glass film is obtained using a silicone polymer, metal oxides, and Na
2 CO
3 as starting materials. The characterization of the glass and its humidity-sensing properties are studied. Cracks and pores exist on the glass surface. One of the main constituents of the glass is thought to be non-stoichiometric sodium silicate. The electrical resistance at each relative humidity is lower by about one order of magnitude compared with the taken in the absence of Na
2CO
3. The dominant charge carriers of the surface electrical conduction are hydrated sodium ions. The humidity-sensitive glass film, which has a good water resistance property, is found capable of sensing humidity stably for a long time.
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