The clay film “Claist,” which comprises a natural or synthetic clay as a main component, exhibits uniform orientation of clay particle laminates. It is flexible, has a mechanical strength sufficient for use as a self-standing film, and has a structure in which laminates of clay particles are highly oriented. The thickness of Claist is 10-100 micrometers, and can be made thicker by layering. The gas permeability at room temperature to hydrogen, oxygen, nitrogen and other inorganic gases is lower than the detectable limit. The gas barrier performance of Claist remains unchanged up to 600°C. Claist is flexible enough to be folded like paper without cracking. The standard Claist film shows a tensile strength of 19.2 MPa and an elongation of 2.2%.

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