Accession Number : AD0248978

Title :   THERMOCHEMICAL ANALYSES OF A PYROTECHNIC SMOKE MIXTURE

Corporate Author : NAVAL AMMUNITION DEPOT CRANE IN

Personal Author(s) : FOWLER, F.D. ; PURDIE, J.E. ; WALKER, W.L.

Report Date : SEP 1960

Pagination or Media Count : 1

Abstract : From thermal investigation of the smoke mixture, it was concluded that the changing of thiourea to ammonium thiocyanate at 160C was the ignition determining factor. When this transition occurred, it catalyzed the decomposition of the potassium chloride, causing the ignition of the mixture. The presence of the red dye will also catalyze the decomposition of the potassium chlorate, but (over) not nearly to the extent as ammonium thiocyanate. Exposure of the smoke mixture and its ingredients to an environment of 95% RH and 85F for 8 days had no pronounced effect. The energy of activation of the smoke mixture, however, increased upon exposure. This is due in part to the fact that the samples were air dried for two hours before analysis; therefore, some absorbed water was still present. This increase in the energy of activation proves that the mixture is more difficult to ignite upon exposure to humid environments. The smoke mixture was in no way responsible for the accidental explosion of the wave-off signal during the JAN cycle. The addition of sodium bicarbonate acts as a coolant to the mixture and increases its energy of activation. The increase of the activation energy of the mixture not containing the bicarbonate, when exposed to humidity, was approximately equal to that of the mixture containing the bicarbonate. (Author)

Descriptors :   *COLORED SMOKES, *IGNITION, *PYROTECHNICS, *QUINONES, *SMOKE, *THERMOCHEMISTRY, ACCIDENTS, ANTHRACENES, EXPLOSIONS, HUMIDITY, INSECTICIDES, METHYL RADICALS, NITROCELLULOSE, POTASSIUM COMPOUNDS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE