Claims
- 1. A metal-cored gasket comprising, in combination:
- a metal core;
- a facing layer bonded to each side of said core, at least one opening through said core and said facing layer, an eyelet in said opening, said eyelet having flanges seated in said facing layers in facing layer deforming relation, each facing layer consisting essentially of asbestos, rubber and microspheres, said rubber and asbestos being present in relative amounts so as to exhibit a compression set greater than 50% in the absence of said microspheres, said microspheres being present in amount up to 75% by volume and which amount is sufficient locally to modify said facing layer to permit crushing thereof by an associated eyelet flange at a pressure to protect said eyelet from incipient cracks incident to incorporation thereof in the gasket.
- 2. A metal-cored gasket material according to claim 1, wherein the microspheres have a diameter of from about 20 .mu.M to 200 .mu.M and a wall thickness of from 5% to 15% of their diameter.
- 3. A metal-cored gasket material according to claim 1, wherein the microspheres are fuel ash cenospheres.
- 4. A metal-cored gasket according to claim 1 wherein the microspheres are coated with a bonding agent before compounding with the rubber and asbestos.
- 5. A metal-cored gasket material according to claim 4 wherein the bonding agent is a silane.
- 6. A metal-cored gasket material according to claim 1 wherein the facing layer has a rubber content in the range 15% to 30% by volume and an asbestos fibre content of from 10% to 70% by volume.
Parent Case Info
This application is a continuation-in-part of my copending application Ser. No. 515,410, filed Oct. 16, 1974 now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1,362,174 |
Jul 1974 |
UK |
1,362,657 |
Aug 1974 |
UK |
Non-Patent Literature Citations (1)
Entry |
"Cenospheres in Pulverized-fuel ash," Journal of the Institute of Fuel," Sept. 1968, pp. 339-344. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
515410 |
Oct 1976 |
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