Powder coating

powder coating is a surface finishing technique in which dry paint is applied to a surface. It produces a finely finished surface that is similar to a 2-pack wet paint. This method of painting or coating is perhaps the latest having been introduced in the 1960's. This method has become extremely popular among designers and homeowners because of the elegance it gives a surface. Representing about 20 percent of the painting industry, dry painting or powder coating as it is commonly known produces high-quality finishes that are also durable. It allows for better decorative finishes and comes in a variety of colors and textures. This method of painting is commonly used in protective as well as decorative finishes. What's more, it can be used in commercial, industrial and custom applications.

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How this technique Works


Powder coating is designed based on the polymer resin systems. However, its benefits are derived from the fact that resin systems are combined with other techniques, including flow modifiers, leveling agents, curatives and pigments for higher quality finishes. All these ingredients are melted, mixed and finally cooled before they are grounded into finer and uniform powder. Electrostatic spraying deposition (ESD) is deployed to help apply the dry powder on a metal substrate.



A spray gun is used to apply powder in this method. The spray gun uses electrostatic charges to make them attracted to surface. After the powder has been applied, the metal parts are then cured with the help of heat. The application of the heat is to ensure that the powder reacts chemically to produce molecular chains, which produces high cross-link density. The resultant molecular chains are not prone to breaking. This is the commonest approach of application of powders. Aside from metal surfaces, powder coating can also be used on non-metallic substrates, including plastics as well as medium density fiberboards.



In some cases, powder coating may be applied in fluidized bed application in which preheated parts are literally dipped in a container of fluidizing powder to melt the coat and cause the powder to flow on the metal substrate. However, post cure may be required depending on the type of powder, the mass of the surface and the prevailing temperatures during the fluidization. Regardless of the method of applying powder coating, the process is easy, less costly, environmental friendly and produces a tough surface.





Is Powder Coating Durable?


Whether on metal parts or plastics, powder coating produces high-quality finishes in all its applications. It can be used to protect the toughest and roughest equipment and protect your household items as well. Its finish is durable compared to liquid paints and the outcome is attractive. Items that have been powder coated are resistant to diminishing quality that is common in wet painting since it is not affected by extreme weather conditions, moisture, ultraviolet light or chemical impact. This means that powder coating is not vulnerable to chipping, scratching, abrasions, corrosion, fading or other common wear issues that are common in other methods of applying finishes.