Sealing material on the basis of polytetrafluoroethylene fibers

Details Sealing material on the basis of polytetrafluoroethylene fibers Sealing material on the basis of polytetrafluoroethylene fibers

1977-09-15

1979-06-05

Michl, Paul R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 291SB, 260 334F, 260 336F, C08K 304

Patent

active

041573285

ABSTRACT:
The invention describes a sealing material from polytetrafluoroethylene fibers, whose staple length is in the range of from 1 to 20 mm. They are intimately mixed with graphite; oil and finely divided polytetrafluoroethylene being advantageously added. The portion of PTFE fibers is at least 50% by weight, the portion of graphite is from 10 to 30% by weight, and the portion of finely divided PTFE is from 5 to 15% by weight. As PTFE fibers there are also used those which have been obtained by machining sintered PTFE resin. The sealing material is formed into tablets or half-rings.
The seals prepared are marked by their applicability at uncommonly high pressures.

REFERENCES:
patent: 2586357 (1952-02-01), Llewellyn
patent: 2593582 (1952-04-01), Lontz
patent: 2644802 (1953-07-01), Lontz
patent: 2782180 (1957-02-01), Weidman
patent: 3766130 (1973-10-01), Johnson
patent: 3992350 (1976-11-01), Bensa
patent: 3993584 (1976-11-01), Owen
patent: 4042747 (1977-08-01), Breton

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