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How does powder coating form a solid film on an object?
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Powder coating forms a solid film through a process of melting and fusing solid, pigmented polymer particles. Unlike liquid coatings that rely on the evaporation of solvents, powder coating involves applying these particles to an object via a spray or a fluidized bed.
Once applied, the object is heated, causing the individual polymer particles to melt and coalesce. This fusion process creates a continuous, solid film on the surface of the substrate. While other chemical reactions may occur during this stage, the primary mechanism for film formation is the thermal melting and subsequent coalescence of the particles into a uniform layer.1