Heat and fire resistant protective covering for hoses, cables and the like
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United States of America Patent
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Feb 2, 1993
Grant Date -
N/A
app pub date -
Jul 3, 1990
filing date -
Jul 5, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fire-proofing protective covering for an elongate structure such as a hose, an electrical or optical cable, or pneumatic or hydraulic ducting, comprises: a first plurality of layers made of an inorganic material having a structure which is suitable for imprisoning air while still allowing the operation of the elongate structure to be maintained at relatively high temperatures, of the order of at least 850.degree. C., and for a given length of time, of the order of at least several minutes, and a second plurality of layers, with each of the layers being disposed alternately relative to each of the layers of the first plurality so that the layers of the first plurality are on the inside while the layers of the second plurality are made of a material which substantially constitutes a barrier for the air imprisoned in the corresponding layer of the first plurality. The invention is applicable to the opto-electrical industry, to the hydraulic industry, etc. . . . for protecting ducting from fire.
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