Powder coating is a type of coating that is applied as a free-flowing, dry powder. Unlike conventional liquid paint which is delivered via an evaporating solvent, powder coating is typically applied electrostatically and then cured under heat.
A process called electrostatic spray deposition (ESD) is typically used to achieve the application of the powder coating to a metal substrate. This application method uses a spray gun, which applies an electrostatic charge to the powder particles, which are then attracted to the grounded part.
The curing process for powder coating is normally done in a special oven; Most powder coatings have a particle size in the range of 2 to 50 μ (Microns), a softening temperature Tg around 80 °C, a melting temperature around 150 °C, and are cured at around 200 °C. for minimum 10 minutes to 15 minutes (exact temperatures and times may depend on the thickness of the item being coated).
Mild steel, galvanized and electroplated steel, aluminum, stainless steel, and most other steel alloys can be powder coated. Powder coating is adaptable and can be applied to materials ranging from metal to wood to glass and plastics.
Powder coating is resistant to cracking, peeling, chipping, abrasion, rust and damage due to chemical exposure. While it isn't indestructible, it is highly durable, retains colour and gloss, goes on uniformly, has excellent UV stability and is a far more environmentally friendly option than traditional liquid paint.
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