Patent ID: 9140362
Filing Date: 2015-09-22
Classification: B32B,C04B,F16J,Y10S,Y10T

Abstract:
1. A flat gasket produced by cutting out a composite plate consisting essentially of an alternating stack of at least 3 flexible graphite foils and at least 2 perforated metal reinforcing foils with spurs, such that a first and a last foil of said alternating stack comprise flexible graphite foils, wherein the thickness of each of said flexible graphite foils is the same or different, wherein (a) any 2 mm slice of thickness of the composite plate (i) comprises at least 3 layers of flexible graphite, and (ii) has a density per unit area of not more than 2.34 kg/m2; (b) for each of said perforated metal reinforcing foils, the spurs present on said foil have a height in relation to the surface of said foil that does not exceed about 1.3 times the thickness of the thinnest flexible graphite layer to which said foil is attached; and (c) the individual thickness of said metal reinforcing foils is between 40 and 60 μm, wherein said metal reinforcing foils comprise at least one selected from the group consisting of: steel, stainless steel, nickel, nickel alloys, aluminium, aluminium alloys, copper and copper alloys, and wherein said flat gasket has a maximum permissible stress QSmax determined in accordance with standard EN 13555, at 400° C., which is at least 180 MPa.