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Powder coating

Powder coating is a relatively new metal coating technique and was first introduced in the early 1970's. In this process, powdered resins along with coloured pigments 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 powder coatings on Aluminium has increased dramatically. The wide variety of powder types now available allow the engineer or architect to specify powder coating with confidence.


As with solvent based paints thermosetting powders can be formulated to produce high and low gloss decorative coatings , Metallics as well as textured & hammered finishes. The standard colour range gives customers ample choice and if need be, special colour matches and finishes can be made.

 

The Process.


Aluminium components are cleaned and to improve adhesion they can be primed. It is very important that during the priming stage the component is kept clean, for this reason Anodising although expensive is an ideal pre-treatment for painting .

Zinc chromate can also used, but over the last few years a number of problems have arisen with this form of pre-treatment.

The components are then suspended on a jig or wire and passed through the spray booth where the powder is applied by Spray Guns . Powder spray guns can be adjusted for powder and air volume, after spraying the paint is cured in an oven. Time and temperature vary in accordance with paint types but 200°C for 20minutes is an average.

Type of Powder

Property

Standard Polyester

Enhanced   Polyester

Epoxy

Hybrid

Polyurethane

Acrylic

PVDF

Exterior Durability

Good

Excellent

Very Poor

Poor

Good

Excellent

Excellent

Corrosion Resistance

Good

Good

Excellent

Good

Good

Good

Good

Impact

Excellent

Poor

Excellent

Excellent

Good

Poor

Excellent

Flexibility

Excellent

Good

Excellent

Excellent

Good

Good

Excellent

Adhesion

Excellent

Excellent

Excellent

Excellent

Excellent

Excellent

Poor

Cost

Medium

Medium / High

Medium

Low

Medium

High

High

Film Appearance @ 50µ

Good

Very Good

Good

Good

Excellent

Good

Poor

Volatile Emissions

Very Low

Very Low

Very Low

Very Low

Low

Very Low

Very Low

Low Bake

Yes

No

Yes

Yes

No

Yes

No

Chemical Resistance

Good

Good

Excellent

Very Good

Good

Very Good

Good

Gloss Range

10-95%

20-95%

5-90%

5-90%

5-95%

30-90%

30-60%

Heat Resistance

Very Good

Good

Poor

Good

Very Good

Good

Good

Abrasion

Good

Good

Very Good

Good

Good

Good

Poor

Compatibility

Good

Good

Good

Good

Good

Very Poor

Very Poor

 

 

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