What substances do fireworks contain?

Pyrotechnics are the source of the effects of fireworks such as sound, color, light and smoke, and also the chief culprit of combustion and explosion accidents. The harmful substances involved in initiating explosive devices are mainly divided into the following six types.

1, flammable liquid. Refers to a liquid that burns easily at room temperature. Flammable liquids used in the production of fireworks and firecrackers are mainly solvents for resin binders, such as alcohol, banana oil, toluene, gasoline, etc.

2. Flammable solids. Refers to the solid with low ignition point, which is sensitive to heat, impact and friction, easily ignited by external flame, and rapidly burns and emits toxic smoke or gas. Flammable solids commonly used in fireworks production include sulfur, camphor and aluminum powder.

3, spontaneous combustion items. Refers to the substance that will burn by itself due to its own chemical changes or the influence of environmental temperature and humidity without touching an open flame. Charcoal powder in the raw materials of black powder belongs to spontaneous combustion.

4. Flammable items when wet. A substance that reacts violently with water or moisture and releases a large amount of combustible gas and heat. Flammable substances commonly used in fireworks production include aluminum powder, aluminum-magnesium alloy powder, zinc powder, silicon-aluminum alloy powder, ferrosilicon and so on.

5, oxidant. It refers to the substance with strong oxidation and easy to release oxygen and heat, and it is the most accident-prone substance in pyrotechnics. The oxidants used in initiating explosive device mainly include nitrate, perchlorate, peroxide, oxide, permanganate, carbon tetrachloride, hexachloroethane and other anaerobic substances.

6. Toxic substances. Barium perchlorate, sodium fluoride, sodium fluorosilicate, hexachloroethane, barium oxide, barium chloride, copper thiocyanate, etc. All the pyrotechnic materials are toxic substances.

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