Powder
Coating

Powder coating is one of the most advanced coating processes available, offering an excellent finish for durability and longevity. It is a method of applying a decorative and protective finish to a wide range of materials and products.

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Powder coatings are based on polymer resin systems, combined with curatives, pigments, levelling agents, flow modifiers and other additives. These ingredients are melt mixed, cooled and ground into a uniform powder, similar in texture to baking flour. The powder is typically applied to a metal substrate using electrostatic spray deposition (ESD). A spray gun gives the powder particles an electrostatic charge, and they are then attracted to the grounded part.

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Once the powder has been applied, the parts enter a curing oven. Heat triggers a chemical reaction in the coating, forming long molecular chains with a high cross-link density. These chains are highly resistant to breakdown, which gives the finish its toughness. Electrostatic spray is the most common method of applying powder, but powder coatings can also be applied to non-metallic substrates such as plastics and medium density fibreboard (MDF). Fluidised bed application is sometimes used as well. Preheated parts are dipped into a hopper of fluidised powder, where the coating melts and flows out across the surface. Depending on the mass and temperature of the part and the type of powder used, a post cure may be needed. Whichever method is used, powder coatings are easy to use, environmentally friendly, cost effective and tough.

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Powder coating is a durable finish, usually specified as the cosmetic top coat over electropainting or phosphate, and is available in a wide range of colours. Turnaround is normally within 24 hours, or 48 hours with e-coat.

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Our 4m x 2.5m x 3m shot blasting room works hand in hand with the new powder coating facility, making sure every product meets the highest standard of quality and the requirements of our customers. You can find out more about shot blasting here.