Thermal analysis of pyrotechnic mixture-fireworks, atom-bomb

Sound level produced from two varieties of sound producing fireworks of atom-bomb, cake bomb and thunder bomb were measured. The pyrotechnic mixture, KNO3/S/Al(H3BO3) of compositions 57.5/19.9/22.1(0.5)% very much similar to commercial atom-bomb were taken and five cake bomb and seven thunder bomb with different net weight of chemicals were manufactured specifically for analysis. Cake bomb with 1g pyrotechnic mixture and thunder bomb with 2g pyrotechnic mixture produce <125 dB(A.I) and < 145 dB (C)pk of sound. As the weight of mixture increases in the same volume, sound level produced from the atom-bomb also increases. The response of the material to a variety of stimuli like friction, impact and heat which can cause danger transport is determined for safe handling procedures. Friction sensitivity of the pyrotechnic mixture was found to be 324 N; high value indicates low friction sensitivity. Impact sensitivity was found to be 5.3 J, comparable with other explosive materials. Bulk density and M-packing density was found to be 0.44g cm-3. Ignition temperature of the mixture is above the melting point of the metallic fuel, Al (660 deg C) and self propagating decomposition occurred at high temperature. The pyrotechnic mixture, KNO3/S/Al(H3BO3) is a safe mixture from accidental factor, static electricity. DSC studies indicate slight formation of potassium nitrite with evolution of NO above 400 deg C. (author)