What Is Powder Coating?

Published on 14th February 2019
Powder coating is something that each and every one of our structures undergoes. It helps to protect their aluminium frameworks, gives a high maintenance finish and provides the colour of choice for each new structure. What is it powder coating though, and why do we choose to use it?

Powder coating is simply a way of applying paint – in the colour of your choice – to our bespoke aluminium frames. By using a six-step testing process, our in house powder coating plant can produce consistent, high-quality paint coverage across entire aluminium extrusions. We’ve also introduced an environmentally friendly process to aid paint adhesion, which replaces chromate with harmless Phosguard.


So, what is powder coating?

To sum it up, powder coating is an alternative, environmentally friendly method of applying paint to metalwork.

Why powder coat?

Powder coating produces a high specification coating with a relatively hard, durable and tough finish. The choice of colours is infinite. At Apropos we offer 6 standard shades but are happy to delve deeper into the colour chart if something else catches your eye. Correctly applied powder coating, although not metallurgically bonded to the metal, will not crack, chip or peel as with conventional paint films and needs very little maintenance.

How is powder coating applied?

Before being sent into the electrostatic spray gun, the powder is fluidized to separate the individual grains of powder from one and other. This will improve the electrostatic charge applied to the powder and help the powder to flow more easily. Once electrostatically charged, the powder is sprayed and wraps around the back of the earthed aluminium component, ensuring 100 per cent material coverage.

The powder will remain attached to the part as long as some of the electrostatic charge remains on the powder. To obtain the final solid, tough, abrasion resistant coating the powder coated items are placed into an oven. They are then heated to temperatures that range from 160° to 210° degrees (C).

Under the influence of heat a thermosetting powder goes through four stages:

  1. Melt,
  2. Flow,
  3. Gel,
  4.  Cure.

The final coating is continuous and will vary from high gloss to flat matt depending on the specification of the powder itself.


Book a factory tour today to come see our powder coating plant for yourself, or download our brochure for inspiration. 

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