| 摘要 |
A gasket comprises a sealing layer formed from a resilient material which comprises particles of chemically-exfoliated vermiculite bonded together, the layer being at least 200 microns in thickness. The layer also comprises 1-90% by weight of a plate-like filler. The particles of the plate-like filler tend to orientate themselves into the plane of the layer and act like a large number of tiny leaf springs to improve sealing. The plate-like filler may be selected from the group consisting of talc, molybdenum disulphide, hexagonal boron nitride, soapstone, pyrophyllite, milled thermally exfoliated vermiculite, mica, fluoromica, powdered graphite, glass flake, metal flake, ceramic flake or kaolinites. The layer may also have an organic binder in the form of a hydrolysis-resistant polymer coupled to the vermiculite by a coupling agent. |
