Ignitability of Energetic Compositions in the Presence of Flammable Liquids.

摘要

A study was therefore performed in which selected pyrotechnic-type blends were exposed to the propagating flame of the flammable liquid. This was accomplished by use of a sealed combustion vessel in which a vapor-air mixture of known concentration (ranging over the entire flammability limit range) was ignited over a layer of loose,dry powder. Substances tested included illuminating flare,time-delay,smoke and igniter compositions. The flammable liquids were ethyl alcohol,acetone,methyl acetate and styrene. The results show that a number of compositions,especially of the igniter and delay type,are easily ignited by a transient flame. Smoke compositions appear to require an incubation period prior to ignition while flare compositions and some delay compositions failed to ignite. The ignitability of wet compositions was also evaluated via ignition in an open pan. The results of these tests indicate that the mixture will ignite only after the volatile liquid is consumed.