Flexible, asbestos-free gasket material
AssigneeT&N Materials Research Limited
InventorsRobert A. Lancaster, Noel C. McKenzie, Brian Hargreaves
Life of this patent
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Abstract
Non-asbestos flexible sheet material suitable for use in gaskets for the cylinder head of an internal combustion engine is made by dewatering on a water-permeable conveyor a layer of aqueous slurry and compressing and drying the dewatered layer, the aqueous slurry employed being one that contains the following ingredients in the following proportions by dry weight: ______________________________________ ball clay 25-44% calcium silicate of high specific 15-40% surface area cellulose fibres 3-15% organic polymer binder 5-15% fibrillated poly (aromatic amide) 1-15% fibres ______________________________________
Claims6
Non-asbestos flexible sheet material made by dewatering on a water-permeable conveyor a layer of aqueous slurry and compressing and drying the dewatered layer, and calendering the dried dewatered layer, the aqueous slurry employed being one that contains the following ingredients in the following proportions by dry weight:
- ______________________________________ ball clay 25-44% calcium silicate of specific 15-40% surface area of at least 10 m.sup.2 /gram cellulose fibres 3-15% organic polymer binder 5-15% fibrillated poly(aromatic amide) fibres 1-15%. ______________________________________
Dependencies are inferred from the claim text.