POWDER COATING

Powdercoating is a relatively new metal coating technique and was first introduced in the early 1970's. In this process, powdered Epoxy - Polyurethane resins along with coloured pigmnents are applied to metal products using an electro-static charge. The product is then "baked" in a high temperature oven causing the powder to melt, flow, and then cure, forming a molecular fusion bond. The result is a surface - to- coating bonding unlike any other.

Over recent years the application of thermosetting powdercoatings on aluminium has increased dramatically.

The wide variety of powder types now available allow the engineer or architect to specify powdercoating with confidence. Polyester thermosetting powder is the most commonly specified product because of its excellent resistance to natural weathering, a high degree of chalk resistance and colour fastness, a high level of mechanical properties and good chemical and corrosion resistance.

The colour range gives customers ample choice and if need be, special colour matches can be made.

The Process.

Components are carefully cleaned using a mixture of mild to aggressively granular media involving a hard sanding process to create surface "bite" assuring adhesion and consistent powder flow.

The pre-baking cycle purges trapped moisture, oils and gasses that cause surface contamination.

Using a high temperature silicone media, all machined, threaded or "mating" surfaces are carefully masked after the pre-baking cycle. Followed by an additional chemical cleaning step, completing the preparation process.

Next the parts are coated using a special electrostatic spray gun that is charged with 30,000 - 90,000 volts. This process applies the powder in a smooth and even coating.

Once coated, the parts are cured in a convection style oven at approximately 375 degrees.

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