This was originally produced by mechanical means using astamp mill to create flakes. Subsequently, a process of spraying molten aluminium to create a powder of droplets was developed byE. J. Hall in the 1920s. The resulting powder might then be processed further in aball mill to flatten it into flakes for use as a coating or pigment.[1] Aluminium powder features low density with high conductivity.[2]
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Powdered aluminium shares many of the physical characteristics of bulk aluminium such as its molecular weight of 26.981538 g mol−1,[3] melting point of 660 °C,[4] and a boiling point of 2460 °C.[5]
Aluminium is insoluble. Although aluminium is unlikely to be adsorbed into the blood stream, its inhalation can cause severe irritation and hinder the ventilation mechanism.[9] High levels of exposure over many years may result inaluminosis which causespulmonary fibrosis.[10]
Aluminium powder and dust is highly flammable and creates a significant risk of fire or explosion. There have been many incidents in industries which produce such dusts and powders.[11]
^"Aluminium, Dusts containing aluminium as metal, aluminium oxide and aluminium hydroxide",MAK Value Documentation, 2007,doi:10.1002/3527600418.mb742990vere4313
^Urben, Peter (2013-10-22),Bretherick's Handbook of Reactive Chemical Hazards, Elsevier, p. 22,ISBN978-0-08-052340-8
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