Asbestos-free sheet material for spiral-wound gaskets
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 the manufacture of spiral wound gaskets 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: china clay 20-50% mica or chlorite 20-50% graphite 10-40% cellulose fibres 2-10% vitreous fibre in wool form 2-10% synthetic organic polymer binder 2-10%.
Claims2
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, the aqueous slurry employed being one that contains the following ingredients in the following proportions by dry weight:
- china clay:
- 20-40%
- mica or chlorite:
- 20-50%
- graphite:
- 10-40%
- cellulose fibres:
- 2-10%
- vitreous fibre in wool form:
- 2-10%
- synthetic organic polymer binder:
- 2-10%.
Dependencies are inferred from the claim text.