What is Powder Coating?
Powder coating is a type of dry coating, which is applied as a free-flowing, dry powder. The coating is applied electrostatically and is then cured under heat to allow it to flow and form a hard finish that is tougher than conventional paint.
The application of powder is very simple. Filtered, compressed air at 20-30 psi pushes the powder out of the powder gun past the electrode which gives the powder a positive charge. The part being coated is grounded so the positive powder particles are attracted to it. When the part is completely covered, the ground is removed and the part is put into the oven to bake at 180-200degC for 10-15 minutes.
There are several advantages of powder coating over conventional liquid coatings:
- Powder coatings emit zero or near zero volatile organic compounds (VOC)
- Thicker coatings than conventional liquid coatings without running
- Less hazardous waste than conventional liquid coatings
- Fewer appearance differences between horizontally coated surfaces and vertically coated surfaces than liquid coated items