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Powder Coatings

Why Powder Coating?

Applications

Powder Coatings are a blend of resins, curing agents and pigments, which are melt-mixed (extruded) and pulverized into finely divided particles. They are totally solvent free.

Typically applied to metal products by electrostatic spray, the coated item is then heated and the powder melts into a smooth, continuous and encapsulating film. When thermosetting resins are used, the coating changes chemically (crosslinking) during cure, resulting in a decorative / functional finish with superior performance characteristics.

Features & Benefits

Powder technology is growing as a preferred coating alternative due to the significant benefits of its features:

Features Benefits
Enviromental
VOC emissions reduced to near zero. One step compliance, virtually 100% solids.
No sludge or solvent disposal. Significant reduction in disposal costs.
Virtually 100% material usage, over spray can be reclaimed. Typically lower applied material costs.
Reduced health, fire, safety hazards. Cleaner plant operations, reduced costs.
Performance & Quality
Tougher, more durable coating. Eliminates extra packaging & handling.
More imperious film - higher cross-link density of powder chemistries offer porosity. Excellent corrosion & humidity resistance.
Colour gloss consistency - improved product & batch-to-batch uniformity. Eliminates on-site mixing, reduced labour cost.
Productivity
Ease of application. Faster deposition and single pass coating simplify training procedures. Increased productivity.
Fewer rejects - no drips, runs or sags; allows easier re-spray procedures before curing. Lower reject costs, more productivity.
Reduced clean – up & maintenance. Can be vacuumed off. Reduced labour, clean up cost.
Powder Classifications

There are two basic classifications of powder coating materials. They are "thermoplastic" and "thermoset" powders.

Thermoplastic powders

Thermoplastic powders are generally applied to a surface that has been pre-heated to a temperature significantly higher than the melting point of the powder. It melts and flows when heat is applied but continues to have the same chemical composition when it solidifies on cooling. Nylon powder coating materials are the most commonly used thermoplastic powders. Thermoplastic coatings are known for their wear and chemical resistance.

Thermoset powders

Thermoset powders are 100% solvent-less and are generally applied by means of electrostatic spray equipment that provides each powder particle with a small electric charge, which in turn sticks to the earthed substrate. Thermoset powder coating systems offer broad formulation flexibility. They are very durable and are widely used.

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