Sound-proofing material for vehicle engine compartment - with thermoplastic sheet contg. bitumen, asbestos fibres and particulate filler

Abstract

Abstract Soundproofing material for vehicle engine compartment, with or without interposition of >=1 layer of another material comprises a self-supporting sheet of a thermoplastic compsn. consisting of 100 pts. wt. bitumen 45-150 pts. wt. asbestos fibre strands, and 110-350 pts. wt. of a particulate filler material with a specific gravity of >=3. Pref. the asbestos fibres are incorporated in the form of several separate layers parallel to the plane of the sheet, and the filler material is in the form of particles of uniform size nearly all of which can pass through a sieve of 50 mesh. The material pref. contains =120 pts. wt. >= of asbestos fibre per 100 pts. wt. bitumen, and 300 pts. wt. filler per 100 pts. wt. bitumen. The material has improved total soundproofing and damping of vibrations.

Inventors

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Bibliographic Details