The Effect of Hot Spots on Burning Surface and Its Application to Strobe Light Formation with Mixtures Which Contain No Ammonium Perchlorate

Dr Takeo Shimizu

ABSTRACT:

The objective of this work was to make clear the effect of hot spots or hot spot materials on burning pyrotechnic compositions and to find practicable strobe light compositions without ammonium perchlorate which is not always popular in the firework field, using the effect of hot spot materials. As the hot spot materials, four types, Japanese oak charcoal, red iron, red lead, and potassium dichromate were selected from many substances. The effect of each was examined by burning tests of compositions which contained rosin, usual oxidizers (ammonium perchlorate, potassium perchlorate, and potassium nitrate), and a small quantity of each hot spot material. In this case, the effects did not clearly appear except that of potassium dichromate, which promoted the burning rate of compositions in fairly large extent. Secondly, the effect of red lead and potassium dichromate was examined with compositions that consisted of magnesium, guanidine nitrate, and metal sulfates, which had been thought to be suitable for strobe lights. From the results of experiments, examples of four colored light compositions are shown for practical use. It is concluded that the effects of hot spots are not so clear, when using with compositions which contain usual oxidizers. However, when using with the compositions for strobe light, which do not burn so easily, the hot spot materials are very effective in adjusting the strobe reaction and to obtain the compositions in practical use.


(SH1_047)


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