Dry Powder Coating

Powder coating is a type of dry coating, which is applied as a free-flowing, dry powder. The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form. The coating is typically applied electrostatically and is then cured under heat to allow it to flow and form a "skin." The powder may be a thermoplastic or a thermoset polymer. It is usually used to create a hard finish that is tougher than conventional paint. Powder coating is mainly used for coating of metals, such as "white goods", aluminium extrusions, and automobile and motorcycle parts.There are several advantages of powder coating over conventional liquid coatings:Powder coatings emit zero or near zero volatile organic compounds (VOC). Powder coatings can produce much thicker coatings than conventional liquid coatings without running or sagging. Powder coating overspray can be recycled and thus it is possible to achieve nearly 100% use of the coating. Powder coating production lines produce less hazardous waste than conventional liquid coatings. Capital equipment and operating costs for a powder line are generally less than for conventional liquid lines. Powder coated items generally have fewer appearance differences between horizontally coated surfaces and vertically coated surfaces than liquid coated items. A wide range of specialty effects is easily accomplished which would be impossible to achieve with other coating processes. While powder coatings have many advantages over other coating processes, there are limitations to the technology. While it is relatively easy to apply thick coatings which have smooth, texture-free surfaces, it is not as easy to apply smooth thin films. As the film thickness is reduced, the film becomes more and more orange peeled in texture due to the particle size and TG (glass transition temperature) of the powder.

For more information on Dry Powder Coating talk to Saint Anns Sheet Metal Co. Ltd