| 摘要 |
<p>The present invention relates to sealing materials free from asbestos or oth er inorganic fibrous substances in the form of papers, paperboards, cardboards or plates. The gasket compositions preferably comprise a mixture of non-fibrillated organic fibers having an elongation at break of < 5% (up to 200.degree.C.) and fibrillated P polyaramide fibers as well as, powdered graphite and an elastomeric resin binder. A new and improved proces s for making non-woven, planar sealing materials free from asbestos or other inorganic fibrous substances, is also provided. The reinforcement-forming and sheet-forming organic fibers, binders and fillers are homogenized in a mixer and the mixture is subsequent ly treated with heat and pressure to form the non-woven webs. The new asbestos-free sealing gaskets and materials may be used for technical or industrial applications such as secondary automobile gaskets, cylinder head gaskets, for seals or gaskets used in the constructio n of chemical plants and power plants, and for seals or gaskets used in the construction o f heating systems.</p> |
