Powder Coating

Have you ever noticed the silky and metallic finish of pint that modern generation cars boast of? You will be surprised to know that the thickness of the coating is much less than one micron. This is far less than the thickness of coating achieved by spry painting the vehicle with oil based paints. If the thickness has surprised you, you will be further surprised to know that these coatings are much more tough and last longer than their oil based counterparts are. Manufacturers of vehicles and many other gadgets through a process in which a fine mist of powdered paint, mixed with a combination of fillers, resins, and pigments, which melt and fuse together during the curing process to form a painted finish. The solid particles of powder get charged electrostatically when they exit through a low velocity spray gun, powered by air. The result is a fine and even coating of paint that lasts for many years, and is more scratch resistant when compared to normal paints. This procedure is commonly known as powder coating.

More information on powder coating


Increasing popularity

Used on a wide range of products, the popularity of this process of painting has gained popularity ever since it was initially introduced in the 1960s, and today it accounts for more than 15 percent of the industrial finishing market. An increasing number of companies prefer to use powder coating because of its high quality and durable finish, which allows for maximum production, simplified environmental compliance, as well as its decorative finish. Employed for decorative and protective finishes, these type of coatings are available in a wide spectrum of textures and colours, and the finishing is getting better by the year, thanks to advancements in technology.


How does this coating work?

Such coatings are based on a system of polymer resins, mixed with flow modifiers, levelling agents, curatives, and pigments. All of these ingredients are first melted ad mixed, after which they are cooled and ground into an extremely fine and uniform powder, which has the same uniformity as that of baking powder. The application of this powder to metal substrates is carried out with the help of a special spray gun. The special spray gun applies positive electrostatic charges to the fine particulates of powder, which are attracted by the part which contains negative electrostatic charges. Once the spraying process is over, the coated parts are put inside a curing oven, where it is subjected to heat. As a result of the heat, the coating reacts chemically to produce long molecular chains having an extremely high cross link density.


Advantages

Powder coating is preferred over other types of painting because they are extremely resistant to breakdown. Such a type of coating can also be applied to non metallic substrates such a medium density fibreboard and plastics. You can find such coatings on thousands of products you see on a daily basis. The primary reason why manufacturers of products prefer powder coating is its finish, which is much more attractive and durable than surfaces coated with liquid paints.