Asbestos-free sheet material for spiral-wound gaskets
First Claim
1. 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%.
1 Assignment
0 Petitions
Accused Products
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%.
62 Citations
2 Claims
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1. 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:
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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%. - View Dependent Claims (2)
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Specification
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- Resources
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Current AssigneeT&N Materials Research Limited
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Original AssigneeT&N Materials Research Limited
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InventorsLancaster, Robert A., Hargreaves, Brian, McKenzie, Noel C.
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Primary Examiner(s)Schofer, Joseph L.
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Assistant Examiner(s)TESKIN, FRED M
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Application NumberUS06/550,403Time in Patent Office614 DaysField of Search501/95, 106/DIG. 3, 106/DIG. 4, 106/204, 524/35, 524/443, 524/47, 524/447, 524/449, 524/492, 524/606, 428/237, 428/283, 428/454, 428/450, 428/463, 428/464, 277/227, 277/233, 277/234, 277/DIG. 6, 162/142, 162/156, 162/164.1, 162/181.7, 162/181.8, 162/181.9US Class Current428/450CPC Class CodesD21H 17/68 siliceous, e.g. claysF16J 15/125 generally perpendicular to ...Y10S 277/936 CompositeY10T 428/31699 Ester, halide or nitrile of...Y10T 428/31703 Next to cellulosic
