Waterproof packing
OwnerEdward M. Case, Chester S. Hopperinventors
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Abstract
A low-friction, water- and steam-resistant packing suitable for both static and dynamic applications includes inorganic fiber selected from the group consisting of chemical, electrical, structural and alkali resistant glasses, ceramic, quartz, carbon and graphite materials, and dispersed and dried, but unsintered, polytetrafluoroethylene (TFE). The packing is essentially free of wetting agent and is prepared by combining the inorganic fiber with a TFE dispersion containing a wetting agent and heating the resulting combination to a temperature high enough to decompose the wetting agent but insufficiently high to sinter the particles of the dispersion.
Claims25
A low-friction, water and steam-resistant packing suitable for both static and dynamic applications, said packing comprising inorganic fiber selected from the group consisting of chemical, electrical, structural and alkali resistant glasses, ceramic, quartz, carbon and graphite materials and dispersed and dried but unsintered polytetrafluoroethylene (TFE), said packing being essentially free of wetting agent.
A method of preparing a low-friction, water and steam-resistant packing comprising the steps of combining an inorganic fiber of a material selected from the group consisting of chemical, electrical, structural and alkali-resistant glasses, ceramic, quartz, carbon and graphite, with a polytetrafluoroethylene (TFE) dispersion containing a wetting agent, and heating the resulting combination to a temperature high enough to decompose the wetting agent but insufficiently high to sinter the particles of the dispersion.
Dependencies are inferred from the claim text.