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Frederick Van Der Sypt, M.D. Abstract: Polysulfide sparklers are renowned for their delicate spark display and complex reaction dynamics, rooted in the centuries-old Japanese tradition of Senko Hanabi. However, modern challenges such as regulatory restrictions and manual production costs threaten their survival. Recent innovations—including the use of (bi)carbonate-based compositions and the integration of metal powders—have …
Continue reading Dragon Tears: a pellet-based design for safe and optimized polysulfide-glitter sparklers

Xiaolan SONG, Yi WANG, Chongwei AN, Fengsheng LI Abstract: The molecular perovskite high-energetic material (H2dabco)[NH4(ClO4)3] (DAP-4) is a highly promising explosive. Its standard specific impulse (Isp) is up to 3324.2 N·s/kg, and it is currently known as the high-energy material with the highest specific impulse among high explosives. In this work, the energy performances of …
Continue reading A Further Research on Energy Performance of Solid Propellants Substantially Reinforced by DAP-4

Xiaolan SONG, Yi WANG, Chongwei AN, Fengsheng LI Abstract: Molecular perovskite energetic material DAP-4, i.e. (H2dabco)[NH4(ClO4)3], is a very excellent explosive, but its friction sensitivity is too high and the raw materials are slightly expensive. Therefore, in order to obtain an explosive with performance close to DAP-4, lower sensitivity and cost than DAP-4, and a …
Continue reading Synthesis, Structure, and Properties of a New Analogical Molecular Perovskite Energetic Material [(C14H31N4)(ClO4)3]

Yi Wang, Xiaolan Song, Chongwei An and Fengsheng Li Abstract: Three very inexpensive and readily available colour composites (red, green, and blue) with different binders were prepared by a mechanical milling method. Their micron morphology, thermal reactions, and safety characteristics were evaluated. In particular, as a focus of this work, their combustion performances were investigated …
Continue reading Luminescent properties of inexpensive and insensitive energetic colour composites with different binders

Richard Harrison Abstract:  Existing models that purport to describe the mechanisms that occur in an ignited pyrotechnic strobe composition can all be shown to fail, in one respect or another, to match the observed behavior. By including separate reaction mechanisms for the smolder and flash phases, the proposed new model can avoid all such failings. …
Continue reading A New Model for Pyrotechnic Strobes

Chee Hang Chan, Wing Cheong Lo Abstract: As the Hong Kong government announced monthly fireworks and pyrotechnics displays to promote the city as a tourist destination in February 2024, some environmental groups raised concerns about the air pollution impact from fireworks and pyrotechnics in the Victoria Harbour, claiming that the monthly fireworks will generate air …
Continue reading A Study of Ambient Air Quality Impact of Fireworks and Pyrotechnics in 2023-2024 in Hong Kong