Federal-mogul Technology Limited

Darryl Alfred Turland

Stephen Peter Bond

Alan William Atkinson

Paul Reuben Percival

A sealing-enhancing coating for a gasket or a portion of a gasket includes flaky particles of chemically exfoliated vermiculite, at least 90% by weight of the particles having a thickness of no more than 30 microns, and no dimension greater than 1 mm. The particles form 10 to 90 wt. % of the coating. The coating also includes 50 to 10 wt. % of an organic polymer binder which when formed into a film 1 mm or less in thickness and heated to 300&#xb0; C. in free air for 24 hours either does not decompose or decomposes leaving a residue of at least 20% by weight of film.

Gasket coating containing chemically exfoliated vermiculite

Sealing material comprises from 45% to 90% by weight exfoliated graphite, from 5% to 20% by weight thermosetting resin and from 5% to 50% by weight fibrous filler which is heat resistant at 250&deg; C. The fibrous filler has fibres at least 90% of which have a fibre length of less than 200 &mgr;m, and an aspect ratio of less than 10:1.

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Ann Arbor, MI, United States of America

Darryl Alfred Turland