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1. US4950530 - Clutch facing

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What is claimed is:
1. In a generally annular clutch facing comprising a fibrous substrate embedded in a matrix of a cross-linked polymeric binder, the improvement in which said fibrous substrate comprises a blend of 100 parts by weight of rock wool, from 10 to 50 parts by weight of organic fiber and from 5 to 50 parts by weight of glass fiber in the form of yarn, strand or cord, or in the form of fabric made thereof.
2. The clutch facing according to claim 1 wherein said fibrous substrate comprises a blend of 100 parts by weight of rock wool, from 20 to 40 parts by weight of organic fiber and from 10 to 30 parts by weight of glass fiber.
3. The clutch facing according to claim 1 wherein said fibrous substrate comprises mixed spun yarn of rock wool, organic fiber and glass fiber.
4. The clutch facing according to claim 3 wherein said fibrous substrate further comprises a metallic wire plied together with said ends of mixed spun yarn of rock wool, organic fiber and glass fiber.
5. The clutch facing according to claim 1 wherein said fibrous substrate comprises ends of composite yarn comprising at least one end of mixed spun yarn of rock wool and organic fiber and at least one end of glass roving.
6. The clutch facing according to claim 5 wherein said fibrous substrate further comprises a metallic wire plied together with said ends of composite yarn.
7. In a generally annular clutch facing comprising a fibrous substrate in the form of woven fabric embedded in a matrix of a cross-linked polymeric binder with warp yarns of the fabric extending circumferentially of the clutch facing, the improvement in which warp yarns of the fabric contain glass fiber, and weft yarns of the fabric contain rock wool.
8. The clutch facing according to claim 7 wherein said warp yarns each comprises ends of glass roving and said weft yarns each comprises at least one end of mixed spun yarn of rock wool and from up to 50 parts by weight, based on 100 parts by weight of the rock wool, of organic fiber.
9. The clutch facing according to claim 8 wherein said warp yarns each comprises said ends of glass roving plied with a metallic wire, and said weft yarns each comprises said at least one end of mixed spun yarn of rock wool and organic fiber plied with a metallic wire.
10. The clutch facing according to claim 7 wherein said fabric is a tape having at least one helix of a metallic wire wrapped around.