With the advent of advanced flight vehicles powered by ramjet power plants, fuel accessory equipment, such as turbopumps, will be subjected to severe environments of: (1) High temperatures (from power plants or aerodynamic heating); (2) low temperatures (from cryogenic fuel tanks); (3) chemical attack (from fuels and oxidizers). The present state-of-the-art is nebulous concerning the seals for this type of application and any successful effort toward the advancement of the art may be of considerable assistance to others in the field. It is with this idea in mind that this paper is presented.

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