Aluminum flake is coated, either with an organic or inorganic coating, to improve upon the problems of explosion risk, spray application, recycling, aesthetics and durability associated with uncoated aluminum flake. One advantage of coated aluminum flakes is that it lowers the specific gravity of the pigment so that it is closer to that of the powder coating resin. This results in a more uniform over spray, with less separation of the flakes from the resin. In addition, the coating makes the pigment less conductive in an electrostatic field and improves spray characteristics. Coated aluminum products are normally derived from higher purity aluminum; this results in brighter aesthetics and better humidity and chemical resistance versus uncoated aluminum flakes.

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