Importance

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Abstract

To provide a means for achieving sufficient sealing performance even in the case of using a highly heat resistant clay film in a high temperature environment exceeding 600° C., minimizing deterioration thereof caused by structural change even in a high temperature environment exceeding 600° C. in the presence of water, and preventing decline in the function of the product caused by the elution of sodium. A member containing a clay film which contains aligned clay particles in the structure thereof and contains, among the clay particles and/or among clay particle layers, a substance decomposing at temperatures, exceeding 100° C. but not exceeding the temperature allowing the release, as water, of structural hydroxyl groups in the clay particles, wherein the member is to be employed in an environment of equal or higher temperatures than the decomposition temperature of the aforesaid substance.

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First Claim