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Pyrotechnic sheet material having an outer protective barrier layer of a passivating material

  • US 5,415,932 A
  • Filed: 08/04/1993
  • Issued: 05/16/1995
  • Est. Priority Date: 08/04/1992
  • Status: Expired due to Fees
First Claim
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1. A pyrotechnic sheet material comprising:

  • a substrate of oxidizing polymeric film;

    an oxidizable material which oxidizes continuously on exposure to atmospheric air applied as a layer on at least a portion of at least one surface of said polymeric film, said polymeric film and said oxidizable material being conjointly capable of reacting together exothermically on ignition; and

    a protective barrier layer of passivating material overlying said oxidizing material, said passivating material being a passive metal or oxide thereof, said passive metal being selected from the group consisting of titanium, aluminum, silicon, chromium, nickel, tin, indium, zinc, copper and alloys thereof, one surface of said barrier layer being in contact with said oxidizable layer and the other surface being exposed, and said barrier layer being effective to reduce the migration of atmospheric air to said oxidizable material.

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