Pyrotechnic sheet material having an outer protective barrier layer of a passivating material
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United States of America Patent
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May 16, 1995
Grant Date -
N/A
app pub date -
Aug 4, 1993
filing date -
Aug 4, 1992
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Expired
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Abstract
The invention provides pyrotechnic sheet material comprising a substrate of oxidizing polymeric film, for example a film of halogenopolymer, having a layer of oxidizable material, for example magnesium on at least part of its surface. The substrate and the oxidizable material are capable of reacting together exothermically on ignition. The oxidizable material is covered with an overlying protective barrier layer of passivating material comprising a passive metal or an oxide of a passive metal. The barrier layer is effective to extend the storage life of the pyrotechnic sheet material by providing a dense non-porous oxide layer which prevents oxidization of the oxidizable material until ignition of the pyrotechnic sheet material occurs.
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