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Fireproof elastic packing material
| Details |
Inventors: Hons-Olivier, Jacques P.; Le Thanh, Tri; Devanz, Francois M.;
Assignee: Impervia, Societe d'Etudes et de Realisations (Courbevoie, FR)
Primary Examiner: Foelak; Morton
Assistant Examiner:
Attorney, Agent or Firm: Darby & Darby
A shapeable, fireproof, elastic packing material suitable for packing joints and the like in the form of a paste or shaped structure which is elastic at low temperature and is capable of swelling at high temperature, e.g. in a fire, to form a solid gas impenetrable barrier. The elastic packing material contains an elastomer, a vulcanizing agent and an intumescent mineral. |
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DETAILED DESCRIPTION What is claimed is: 1.
An elastic packing material comprising a shapeable composition which is elastic at low temperature and which swells at high temperature to form a gas impermeable barrier, said composition comprising a vulcanised mixture of a natural or synthetic rubber binder, a vulcanising agent for vulcanising said binder, an intumescent mineral in an amount from about 4 to about 30% by weight of said mixture, and an alkylaryl-phosphate vitrifying agent for vitrifying said intumescent mineral under the action of heat at said high temperature and preventing pulverization of said intumescent material at said high temperature.
2.
An elastic packing material according to claim 1 wherein said intumescent mineral is vermiculite.
3.
An elastic packing material according to claim 1 wherein said binder is a halogenated binder.
4.
An elastic packing material according to claim 3 wherein said halogenated binder is a polychloroprene.
5.
An elastic packing material according to claim 3 wherein the proportion of said vermiculite to said binder is between 10% and 100% by weight.
6.
An elastic packing material according to claim 5 wherein the proportion of the vermiculite relative to the binder is between 35% and 50% by weight.
7.
An elastic material according to claim 3 wherein said vitrifying agent comprises an alkylaryl phosphoric ester.
8.
An elastic packing material according to claim 3 which comprises a blowing agent for giving said packing material a microcellular structure.
9.
An elastic packing material according to claim 3 wherein said composition includes a fireproofing agent.
10.
An elastic packing material according to claim 3 wherein said composition includes an inert filler.
11.
A paste for packing joints and cracks comprising unvulcanised mixture of a natural or synthetic rubber binder, a vulcanising agent for said binder active at ambient temperature, and from about 4% to about 30% by weight of said mixture of an intumescent mineral, and an alkylaryl phosphate vitrifying agent for said intumescent mineral
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Fuel Cells 
