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In principle, powder coatings present less of a safety risk than conventional wet paint systems do. Compared to solvent vapour/air mixtures, a powder/air mixture requires 50 to 100 times more energy for ignition. Although all flammable powders or dusts which form explosive mixtures with air are potential hazard sources, they may be transported, stored and processed safely if the appropriate requirements are taken into consideration and the relevant safety measures are met.
The minimum ignition energy of aluminium pigments depends significantly on the specific surface area of the pigment particles and on their degree of fineness. Especially fine aluminium pigments (average particle size <10µm) partially display a very low minimum ignition energy of less than 1mJ.
In order to enure safe handling of aluminium pigment powders, is is very important to follow the relevant safety measures from the initial production stage to the final processing step of the aluminium pigmented metallic powder coatings (we would ask you to have a look at the recommendations from ECKART and GDA).