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powder is custom formulated from thermosetting polyester resins, curing agents, pigments and modifiers, to meet specific end-use requirements for durability, chemical resistance, and UV protection. Resins and pigments are mixed while molten and then cooled and solidified. The resulting material has a completely uniform composition. The cooled material is then ground to the desired particle size for application to the metal.

Electrostatic Application Offers More Uniform Coating

Electrostatic spraying is the most common method for applying powder coatings, and is the method chosen by .
powder is fed pneumatically from a reservoir to a spray gun where a low amperage, high voltage charge is imparted to the particles. The parts to be coated are grounded so that the charged particle will seek the oppositely charged metal surfaces. With this method, a single application can produce a uniform, monolithic, fusion-bonded finish.

The powder-coated parts then enter an oven where the resins, pigments, and other reactive agents crosslink to produce a high molecular weight binder system, resulting in a tough, durable coating. The mechanical and physical properties of are listed in Figure 1.

Superiority

was developed for outstanding weatherability, toughness, and architectural aesthetics. When considering the advantages of the powder coating process, it's difficult to understand why anyone would choose a lighting standard coated with liquid paint.

powder coating is 100% solid with every powder particle containing the total color system.
• The high molecular weight of powder coatings provide better corrosion, impact, chip, and scratch resistance, which means less damage.
• Adhesion problems associated with multiple coats of liquid paint are eliminated.
• There are no runs, sags or drips in powder finishes.
• Paint defects such as solvent popping, pinholes, and blistering are eliminated, since there are no solvents in powders.
is highly resistant to diluted aqueous acids, salts, aliphatic and aromatic hydrocarbons, solvents, alcohols, grease and oils.
provides UV protection which eliminates chalking and minimizes color fading. Low molecular weight, liquid systems simply can't compare with high molecular weight powders. Liquid system finishes are easily chipped and scratched, and require constant care to maintain appearance, and most important, to prevent corrosive damage.
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